fix: some fixes

solution/services/backend/api/v1/campaigns/views.py

@@ -172,6 +172,10 @@ def upload_ad_image(
         id=campaign_id,
         advertiser_id=advertiser_id,
     )
+    if ad_image.size >= 10 * 1024 * 1024:
+        raise HttpError(
+            status.BAD_REQUEST, "File can't be bigger than 10MB."
+        )
     try:
         Image.open(ad_image).verify()
     except (OSError, SyntaxError):