diff --git a/breathecode/media/tests/urls/v2/tests_me_chunk_upload.py b/breathecode/media/tests/urls/v2/tests_me_chunk_upload.py
index 68d06e3bd..91b8be065 100644
--- a/breathecode/media/tests/urls/v2/tests_me_chunk_upload.py
+++ b/breathecode/media/tests/urls/v2/tests_me_chunk_upload.py
@@ -2,15 +2,13 @@
 Test /answer
 """
 
-import json as json_utils
 import tempfile
 from io import BytesIO
-from typing import Callable
 from unittest.mock import AsyncMock, MagicMock, PropertyMock, call
 
 import capyc.pytest as capy
 import pytest
-from django.core.files.uploadedfile import InMemoryUploadedFile, SimpleUploadedFile
+from django.core.files.uploadedfile import SimpleUploadedFile
 from django.urls.base import reverse_lazy
 from rest_framework import status
 
@@ -143,7 +141,7 @@ async def test_no_authorized(aclient: capy.AsyncClient, database: capy.Database,
 
     data = {"operation_type": op_type}
 
-    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart")
+    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
     json = response.json()
     expected = {
@@ -175,7 +173,7 @@ async def test_no_total_chunks(aclient: capy.AsyncClient, database: capy.Databas
 
     data = {"operation_type": op_type}
 
-    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart")
+    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
     json = response.json()
     expected = {
@@ -207,7 +205,7 @@ async def test_no_filename(aclient: capy.AsyncClient, database: capy.Database, f
 
     data = {"operation_type": op_type, "total_chunks": 3}
 
-    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart")
+    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
     json = response.json()
     expected = {
@@ -239,7 +237,7 @@ async def test_no_mime(aclient: capy.AsyncClient, database: capy.Database, fake:
 
     data = {"operation_type": op_type, "total_chunks": 3, "filename": "a.txt"}
 
-    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart")
+    response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
     json = response.json()
     expected = {
@@ -272,9 +270,7 @@ async def test_no_chunks(self, aclient: capy.AsyncClient, database: capy.Databas
 
         data = {"operation_type": op_type, "total_chunks": 3, "filename": "a.txt", "mime": "text/plain"}
 
-        response = await aclient.put(
-            url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart"
-        )
+        response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
         json = response.json()
         expected = {
@@ -320,9 +316,7 @@ async def test_upload_file__schedule_deletions(
 
         data = {"operation_type": op_type, "total_chunks": 3, "filename": filename, "mime": "text/plain"}
 
-        response = await aclient.put(
-            url, data, headers={"Authorization": f"Token {model.token.key}"}, format="multipart"
-        )
+        response = await aclient.put(url, data, headers={"Authorization": f"Token {model.token.key}"}, format="json")
 
         json = response.json()
         expected = {
diff --git a/breathecode/media/utils.py b/breathecode/media/utils.py
index 26d339309..7eac9e8b8 100644
--- a/breathecode/media/utils.py
+++ b/breathecode/media/utils.py
@@ -71,7 +71,11 @@ async def upload(self, academy_id: Optional[int] = None):
             )
 
         total_chunks = request.data.get("total_chunks")
-        if total_chunks is None or total_chunks.isnumeric() is False or (total_chunks := float(total_chunks)) <= 0:
+        if (
+            total_chunks is None
+            or isinstance(total_chunks, (int, float)) is False
+            or (total_chunks := total_chunks) <= 0
+        ):
             raise ValidationException(
                 translation(
                     lang,