diff --git a/Pipfile b/Pipfile
index d35597f..6f5407e 100644
--- a/Pipfile
+++ b/Pipfile
@@ -40,6 +40,7 @@ minio = "*"
 xxhash = "*"
 arq = "*"
 thumbhash-python = "==1.0.0"
+python-magic = "*"
 
 [dev-packages]
 coverage = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index 137e927..5ab1769 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "dc7977c3d6c0c72f41144ddb7bc0821c1bd34c856cbf2a93077c809e6b7a9048"
+            "sha256": "c3de18e25234c98fd1b33d4df4464fd6e05a485416c76eb6c4f64e78c497af64"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -1357,6 +1357,14 @@
             "index": "pypi",
             "version": "==3.3.0"
         },
+        "python-magic": {
+            "hashes": [
+                "sha256:c1ba14b08e4a5f5c31a302b7721239695b2f0f058d125bd5ce1ee36b9d9d3c3b",
+                "sha256:c212960ad306f700aa0d01e5d7a325d20548ff97eb9920dcd29513174f0294d3"
+            ],
+            "index": "pypi",
+            "version": "==0.4.27"
+        },
         "python-multipart": {
             "hashes": [
                 "sha256:e9925a80bb668529f1b67c7fdb0a5dacdd7cbfc6fb0bff3ea443fe22bdd62132",
diff --git a/classquiz/db/models.py b/classquiz/db/models.py
index ace21a3..879ee60 100644
--- a/classquiz/db/models.py
+++ b/classquiz/db/models.py
@@ -8,6 +8,7 @@ from datetime import datetime
 from typing import Optional
 
 import ormar
+from ormar import ReferentialAction
 from pydantic import BaseModel, Json, validator
 from enum import Enum
 from . import metadata, database
@@ -58,7 +59,7 @@ class FidoCredentials(ormar.Model):
     id: bytes = ormar.LargeBinary(max_length=256)
     public_key: bytes = ormar.LargeBinary(max_length=256)
     sign_count: int = ormar.Integer()
-    user: Optional[User] = ormar.ForeignKey(User)
+    user: Optional[User] = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
 
     class Meta:
         tablename = "fido_credentials"
@@ -68,7 +69,7 @@ class FidoCredentials(ormar.Model):
 
 class ApiKey(ormar.Model):
     key: str = ormar.String(max_length=48, min_length=48, primary_key=True)
-    user: Optional[User] = ormar.ForeignKey(User)
+    user: Optional[User] = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
 
     class Meta:
         tablename = "api_keys"
@@ -82,7 +83,7 @@ class UserSession(ormar.Model):
     """
 
     id: uuid.UUID = ormar.UUID(primary_key=True, default=uuid.uuid4())
-    user: Optional[User] = ormar.ForeignKey(User)
+    user: Optional[User] = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
     session_key: str = ormar.String(unique=True, max_length=64)
     created_at: datetime = ormar.DateTime(default=datetime.now())
     ip_address: str = ormar.String(max_length=100, nullable=True)
@@ -181,7 +182,7 @@ class Quiz(ormar.Model):
     description: str = ormar.Text(nullable=True)
     created_at: datetime = ormar.DateTime(default=datetime.now())
     updated_at: datetime = ormar.DateTime(default=datetime.now())
-    user_id: uuid.UUID = ormar.ForeignKey(User)
+    user_id: uuid.UUID = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
     questions: Json[list[QuizQuestion]] = ormar.JSON(nullable=False)
     imported_from_kahoot: Optional[bool] = ormar.Boolean(default=False, nullable=True)
     cover_image: Optional[str] = ormar.Text(nullable=True, unique=False)
@@ -307,8 +308,8 @@ class GameInLobby(BaseModel):
 
 class GameResults(ormar.Model):
     id: uuid.UUID = ormar.UUID(primary_key=True)
-    quiz: uuid.UUID | Quiz = ormar.ForeignKey(Quiz)
-    user: uuid.UUID | User = ormar.ForeignKey(User)
+    quiz: uuid.UUID | Quiz = ormar.ForeignKey(Quiz, ondelete=ReferentialAction.CASCADE)
+    user: uuid.UUID | User = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
     timestamp: datetime = ormar.DateTime(default=datetime.now(), nullable=False)
     player_count: int = ormar.Integer(nullable=False, default=0)
     note: str | None = ormar.Text(nullable=True)
@@ -334,7 +335,7 @@ class QuizTivity(ormar.Model):
     id: uuid.UUID = ormar.UUID(primary_key=True)
     title: str = ormar.Text(nullable=False)
     created_at: datetime = ormar.DateTime(nullable=False, server_default=func.now())
-    user: User | None = ormar.ForeignKey(User)
+    user: User | None = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
     pages: list[QuizTivityPage] = ormar.JSON(nullable=False)
 
     class Meta:
@@ -347,8 +348,8 @@ class QuizTivityShare(ormar.Model):
     id: uuid.UUID = ormar.UUID(primary_key=True)
     name: str | None = ormar.Text(nullable=True)
     expire_at: datetime | None = ormar.DateTime(nullable=True)
-    quiztivity: QuizTivity | None = ormar.ForeignKey(QuizTivity)
-    user: User | None = ormar.ForeignKey(User)
+    quiztivity: QuizTivity | None = ormar.ForeignKey(QuizTivity, ondelete=ReferentialAction.CASCADE)
+    user: User | None = ormar.ForeignKey(User, ondelete=ReferentialAction.CASCADE)
 
     class Meta:
         tablename = "quiztivityshares"
@@ -386,7 +387,7 @@ class StorageItem(ormar.Model):
     uploaded_at: datetime = ormar.DateTime(nullable=False, default=datetime.now())
     mime_type: str = ormar.Text(nullable=False)
     hash: bytes | None = ormar.LargeBinary(nullable=True, min_length=16, max_length=16)
-    user: User | None = ormar.ForeignKey(User)
+    user: User | None = ormar.ForeignKey(User, ondelete=ReferentialAction.SET_NULL)
     size: int = ormar.BigInteger(nullable=False)
     storage_path: str | None = ormar.Text(nullable=True)
     deleted_at: datetime | None = ormar.DateTime(nullable=True, default=None)
diff --git a/classquiz/helpers/__init__.py b/classquiz/helpers/__init__.py
index e725b02..622ad0e 100644
--- a/classquiz/helpers/__init__.py
+++ b/classquiz/helpers/__init__.py
@@ -65,12 +65,15 @@ async def generate_spreadsheet(quiz_results: dict, quiz: Quiz, player_fields: di
         worksheet.write(i + 1, 1, question["time"])
 
         try:
-            async with ClientSession() as session, session.get(question["image"]) as response:
-                img_data = BytesIO(await response.read())
-                worksheet.insert_image(i + 1, 2, question["image"], {"image_data": img_data})
-                image = Image.open(img_data)
-                worksheet.set_row(i + 1, image.height)
-                worksheet.set_column(2, 2, image.width)
+            async with ClientSession() as session, session.get(
+                f"{settings.root_address}/api/v1/storage/download/{question['image']}"
+            ) as response:
+                if "image" in response.headers.get("Content-Type"):
+                    img_data = BytesIO(await response.read())
+                    worksheet.insert_image(i + 1, 2, question["image"], {"image_data": img_data})
+                    image = Image.open(img_data)
+                    worksheet.set_row(i + 1, image.height)
+                    worksheet.set_column(2, 2, image.width)
         except TypeError:
             pass
         answer_amount = len(answer_data)
diff --git a/classquiz/routers/eximport.py b/classquiz/routers/eximport.py
index 56758b0..294548b 100644
--- a/classquiz/routers/eximport.py
+++ b/classquiz/routers/eximport.py
@@ -1,6 +1,7 @@
 #  This Source Code Form is subject to the terms of the Mozilla Public
 #  License, v. 2.0. If a copy of the MPL was not distributed with this
 #  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+import io
 import json
 import uuid
 from datetime import datetime
@@ -10,10 +11,11 @@ from aiohttp import ClientSession
 from fastapi import APIRouter, Depends, File, UploadFile, HTTPException
 from fastapi.responses import StreamingResponse
 from classquiz.auth import get_current_user
-from classquiz.config import storage, settings
-from classquiz.db.models import Quiz, User
+from classquiz.config import storage, settings, arq
+from classquiz.db.models import Quiz, User, StorageItem
 import gzip
 import urllib.parse
+import magic
 
 router = APIRouter()
 settings = settings()
@@ -49,7 +51,9 @@ async def export_quiz(quiz_id: uuid.UUID, user: User = Depends(get_current_user)
     for image_key in image_urls.keys():
         bin_data = bin_data + image_delimiter + str(image_key).encode("utf-8") + image_index_delimiter
         image_data = None
-        async with ClientSession() as session, session.get(image_urls[image_key]) as resp:
+        async with ClientSession() as session, session.get(
+            f"{settings.root_address}/api/v1/storage/download/{image_urls[image_key]}"
+        ) as resp:
             image_data = await resp.read()
         bin_data = bin_data + image_data
 
@@ -68,6 +72,8 @@ async def export_quiz(quiz_id: uuid.UUID, user: User = Depends(get_current_user)
 
 @router.post("/")
 async def import_quiz(file: UploadFile = File(), user: User = Depends(get_current_user)):
+    if user.storage_used > settings.free_storage_limit:
+        raise HTTPException(status_code=409, detail="Storage limit reached")
     data = await file.read()
     [split_data, images] = data.split(quiz_delimiter)
     decompressed_quiz = gzip.decompress(split_data)
@@ -75,15 +81,32 @@ async def import_quiz(file: UploadFile = File(), user: User = Depends(get_curren
     image_splits = images.split(image_delimiter)
     quiz_id = uuid.uuid4()
     image_urls = {}
+    print(len(data))
     for image_split in image_splits:
         res = image_split.split(image_index_delimiter)
         if len(res) != 2:
             continue
         [index, image_data] = res
+        print(len(image_data))
+        img_data = io.BytesIO(image_data)
+        mime_type = magic.from_buffer(img_data.read(2048), mime=True)
+        print(mime_type)
         index = int(index.decode("utf-8"))
-        image_name = f"{quiz_id}--{uuid.uuid4()}"
-        await storage.upload(file_name=image_name, file_data=image_data)
-        image = f"{settings.root_address}/api/v1/storage/download/{image_name}"
+        file_id = uuid.uuid4()
+        file_obj = StorageItem(
+            id=file_id,
+            uploaded_at=datetime.now(),
+            mime_type=mime_type,
+            hash=None,
+            user=user,
+            size=0,
+            deleted_at=None,
+            alt_text=None,
+        )
+        await storage.upload(file_name=file_id.hex, file_data=img_data, mime_type=mime_type)
+        await file_obj.save()
+        await arq.enqueue_job("calculate_hash", file_id.hex)
+        image = file_id.hex
         image_urls[index] = image
     quiz_dict["created_at"] = datetime.fromisoformat(quiz_dict["created_at"])
     quiz_dict["updated_at"] = datetime.fromisoformat(quiz_dict["updated_at"])
diff --git a/classquiz/routers/quiz.py b/classquiz/routers/quiz.py
index e15287f..89bd29d 100644
--- a/classquiz/routers/quiz.py
+++ b/classquiz/routers/quiz.py
@@ -209,7 +209,9 @@ async def delete_quiz(quiz_id: str, user: User = Depends(get_current_user)):
     for question in quiz.questions:
         try:
             if question["image"] is not None and not str(question["image"]).startswith("https://i.imgur.com/"):
-                pics_to_delete.append(pic_name_regex.match(question["image"]).group(1))
+                old_image_to_delete = pic_name_regex.match(question["image"])
+                if old_image_to_delete is not None:
+                    pics_to_delete.append(old_image_to_delete.group(1))
         except KeyError:
             pass
     if len(pics_to_delete) != 0:
diff --git a/classquiz/routers/storage.py b/classquiz/routers/storage.py
index d40e073..35672fc 100644
--- a/classquiz/routers/storage.py
+++ b/classquiz/routers/storage.py
@@ -131,7 +131,7 @@ async def upload_file(file: UploadFile = File(), user: User = Depends(get_curren
         deleted_at=None,
         alt_text=None,
     )
-    await storage.upload(file_name=file_id.hex, file_data=file.file)
+    await storage.upload(file_name=file_id.hex, file_data=file.file, mime_type=file.content_type)
     await file_obj.save()
     await arq.enqueue_job("calculate_hash", file_id.hex)
     return PublicStorageItem.from_db_model(file_obj)
@@ -157,7 +157,9 @@ async def upload_raw_file(request: Request, user: User = Depends(get_current_use
         alt_text=None,
     )
     # https://github.com/VirusTotal/vt-py/issues/119#issuecomment-1261246867
-    await storage.upload(file_name=file_id.hex, file_data=data_file._file)
+    await storage.upload(
+        file_name=file_id.hex, file_data=data_file._file, mime_type=request.headers.get("Content-Type")
+    )
     await file_obj.save()
     await arq.enqueue_job("calculate_hash", file_id.hex)
     return PublicStorageItem.from_db_model(file_obj)
diff --git a/frontend/src/lib/admin.svelte b/frontend/src/lib/admin.svelte
index 0370c5d..826e737 100644
--- a/frontend/src/lib/admin.svelte
+++ b/frontend/src/lib/admin.svelte
@@ -227,6 +227,7 @@
 				<div class="flex w-full">
 					<MediaComponent
 						src={quiz_data.questions[selected_question].image}
+						muted={false}
 						css_classes="max-h-[20vh] object-cover mx-auto mb-8 w-auto"
 					/>
 				</div>
diff --git a/frontend/src/lib/editor/MediaComponent.svelte b/frontend/src/lib/editor/MediaComponent.svelte
index 8d3aecc..208a292 100644
--- a/frontend/src/lib/editor/MediaComponent.svelte
+++ b/frontend/src/lib/editor/MediaComponent.svelte
@@ -5,11 +5,17 @@
   -->
 
 <script lang="ts">
+	import { browser } from '$app/environment';
+
 	export let src: string;
 	export let css_classes = 'max-h-64 h-auto w-auto';
+	export let muted = true;
 	let type: 'img' | 'video' | undefined = undefined;
 
 	const get_media = async () => {
+		if (!browser) {
+			return;
+		}
 		const res = await fetch(`/api/v1/storage/info/${src}`);
 		console.log('Headers', res.headers);
 		const fileType = res.headers.get('Content-Type');
@@ -46,13 +52,11 @@
 		<video
 			class={css_classes}
 			disablepictureinpicture
-			disableremoteplayback
 			x-webkit-airplay="deny"
 			controls
 			autoplay
 			loop
-			controlslist="nofullscreen,noremoteplayback"
-			muted
+			{muted}
 			preload="metadata"
 		>
 			<source src="/api/v1/storage/download/{src}" />
diff --git a/frontend/src/lib/practice/question.svelte b/frontend/src/lib/practice/question.svelte
index b582b42..0e9477c 100644
--- a/frontend/src/lib/practice/question.svelte
+++ b/frontend/src/lib/practice/question.svelte
@@ -11,6 +11,7 @@
 	import Spinner from '$lib/Spinner.svelte';
 	import { flip } from 'svelte/animate';
 	import BrownButton from '$lib/components/buttons/brown.svelte';
+	import MediaComponent from '$lib/editor/MediaComponent.svelte';
 
 	export let question: Question;
 
@@ -93,10 +94,9 @@
 	<h1 class="text-3xl text-center">{@html question.question}</h1>
 	{#if question.image !== null}
 		<div>
-			<img
-				src="/api/v1/storage/download/{question.image}"
-				class="max-h-[40vh] object-cover mx-auto mb-8 w-auto"
-				alt="Content for Question"
+			<MediaComponent
+				src={question.image}
+				css_classes="max-h-[40vh] object-cover mx-auto mb-8 w-auto"
 			/>
 		</div>
 	{/if}
diff --git a/frontend/src/routes/edit/videos/+page.svelte b/frontend/src/routes/edit/videos/+page.svelte
index 60ff505..43ba7f8 100644
--- a/frontend/src/routes/edit/videos/+page.svelte
+++ b/frontend/src/routes/edit/videos/+page.svelte
@@ -187,7 +187,7 @@
 	</div>
 	<div class="flex relative my-2">
 		<div class="w-full">
-			<BrownButton disabled={stats.progress !== 1} on:click={upload_video}>
+			<BrownButton disabled={status !== Status.CompressDone} on:click={upload_video}>
 				Upload {file_size_in_mi ? `${file_size_in_mi.toFixed(2)}Mi` : ''}</BrownButton
 			>
 		</div>
diff --git a/frontend/src/routes/view/[quiz_id]/+page.svelte b/frontend/src/routes/view/[quiz_id]/+page.svelte
index ba5283c..499fa0e 100644
--- a/frontend/src/routes/view/[quiz_id]/+page.svelte
+++ b/frontend/src/routes/view/[quiz_id]/+page.svelte
@@ -13,6 +13,7 @@
 	import { onMount } from 'svelte';
 	import Spinner from '$lib/Spinner.svelte';
 	import GrayButton from '$lib/components/buttons/gray.svelte';
+	import MediaComponent from '$lib/editor/MediaComponent.svelte';
 
 	const tippy = createTippy({
 		arrow: true,
@@ -189,10 +190,11 @@
 					<!--					</label>-->
 					{#if question.image}
 						<span>
-							<img
-								class="pl-8"
-								src="/api/v1/storage/download/{question.image}"
+							<MediaComponent
+								css_classes="mx-auto"
+								src={question.image}
 								alt="Not provided"
+								muted={true}
 							/>
 						</span>
 					{/if}
diff --git a/migrations/versions/a1841b1918b3_added_deleteaction_to_models.py b/migrations/versions/a1841b1918b3_added_deleteaction_to_models.py
new file mode 100644
index 0000000..6c4df69
--- /dev/null
+++ b/migrations/versions/a1841b1918b3_added_deleteaction_to_models.py
@@ -0,0 +1,86 @@
+"""Added DeleteAction to models
+
+Revision ID: a1841b1918b3
+Revises: 89c4b5d547aa
+Create Date: 2023-06-09 13:13:00.865587
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import ormar
+
+
+# revision identifiers, used by Alembic.
+revision = "a1841b1918b3"
+down_revision = "89c4b5d547aa"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("fk_api_keys_users_id_user", "api_keys", type_="foreignkey")
+    op.create_foreign_key("fk_api_keys_users_id_user", "api_keys", "users", ["user"], ["id"], ondelete="CASCADE")
+    op.drop_constraint("fk_fido_credentials_users_id_user", "fido_credentials", type_="foreignkey")
+    op.create_foreign_key(
+        "fk_fido_credentials_users_id_user", "fido_credentials", "users", ["user"], ["id"], ondelete="CASCADE"
+    )
+    op.drop_constraint("fk_game_results_quiz_id_quiz", "game_results", type_="foreignkey")
+    op.drop_constraint("fk_game_results_users_id_user", "game_results", type_="foreignkey")
+    op.create_foreign_key(
+        "fk_game_results_users_id_user", "game_results", "users", ["user"], ["id"], ondelete="CASCADE"
+    )
+    op.create_foreign_key("fk_game_results_quiz_id_quiz", "game_results", "quiz", ["quiz"], ["id"], ondelete="CASCADE")
+    op.drop_constraint("fk_quiz_users_id_user_id", "quiz", type_="foreignkey")
+    op.create_foreign_key("fk_quiz_users_id_user_id", "quiz", "users", ["user_id"], ["id"], ondelete="CASCADE")
+    op.drop_constraint("fk_quiztivitys_users_id_user", "quiztivitys", type_="foreignkey")
+    op.create_foreign_key("fk_quiztivitys_users_id_user", "quiztivitys", "users", ["user"], ["id"], ondelete="CASCADE")
+    op.drop_constraint("fk_quiztivityshares_quiztivitys_id_quiztivity", "quiztivityshares", type_="foreignkey")
+    op.drop_constraint("fk_quiztivityshares_users_id_user", "quiztivityshares", type_="foreignkey")
+    op.create_foreign_key(
+        "fk_quiztivityshares_quiztivitys_id_quiztivity",
+        "quiztivityshares",
+        "quiztivitys",
+        ["quiztivity"],
+        ["id"],
+        ondelete="CASCADE",
+    )
+    op.create_foreign_key(
+        "fk_quiztivityshares_users_id_user", "quiztivityshares", "users", ["user"], ["id"], ondelete="CASCADE"
+    )
+    op.drop_constraint("fk_storage_items_users_id_user", "storage_items", type_="foreignkey")
+    op.create_foreign_key(
+        "fk_storage_items_users_id_user", "storage_items", "users", ["user"], ["id"], ondelete="SET NULL"
+    )
+    op.drop_constraint("fk_user_sessions_users_id_user", "user_sessions", type_="foreignkey")
+    op.create_foreign_key(
+        "fk_user_sessions_users_id_user", "user_sessions", "users", ["user"], ["id"], ondelete="CASCADE"
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("fk_user_sessions_users_id_user", "user_sessions", type_="foreignkey")
+    op.create_foreign_key("fk_user_sessions_users_id_user", "user_sessions", "users", ["user"], ["id"])
+    op.drop_constraint("fk_storage_items_users_id_user", "storage_items", type_="foreignkey")
+    op.create_foreign_key("fk_storage_items_users_id_user", "storage_items", "users", ["user"], ["id"])
+    op.drop_constraint("fk_quiztivityshares_users_id_user", "quiztivityshares", type_="foreignkey")
+    op.drop_constraint("fk_quiztivityshares_quiztivitys_id_quiztivity", "quiztivityshares", type_="foreignkey")
+    op.create_foreign_key("fk_quiztivityshares_users_id_user", "quiztivityshares", "users", ["user"], ["id"])
+    op.create_foreign_key(
+        "fk_quiztivityshares_quiztivitys_id_quiztivity", "quiztivityshares", "quiztivitys", ["quiztivity"], ["id"]
+    )
+    op.drop_constraint("fk_quiztivitys_users_id_user", "quiztivitys", type_="foreignkey")
+    op.create_foreign_key("fk_quiztivitys_users_id_user", "quiztivitys", "users", ["user"], ["id"])
+    op.drop_constraint("fk_quiz_users_id_user_id", "quiz", type_="foreignkey")
+    op.create_foreign_key("fk_quiz_users_id_user_id", "quiz", "users", ["user_id"], ["id"])
+    op.drop_constraint("fk_game_results_quiz_id_quiz", "game_results", type_="foreignkey")
+    op.drop_constraint("fk_game_results_users_id_user", "game_results", type_="foreignkey")
+    op.create_foreign_key("fk_game_results_users_id_user", "game_results", "users", ["user"], ["id"])
+    op.create_foreign_key("fk_game_results_quiz_id_quiz", "game_results", "quiz", ["quiz"], ["id"])
+    op.drop_constraint("fk_fido_credentials_users_id_user", "fido_credentials", type_="foreignkey")
+    op.create_foreign_key("fk_fido_credentials_users_id_user", "fido_credentials", "users", ["user"], ["id"])
+    op.drop_constraint("fk_api_keys_users_id_user", "api_keys", type_="foreignkey")
+    op.create_foreign_key("fk_api_keys_users_id_user", "api_keys", "users", ["user"], ["id"])
+    # ### end Alembic commands ###