fix upload local file

apps/core/utils.py

@@ -24,10 +24,10 @@ def download_file(url):
     return local_filename
 
 
-def handle_uploaded_file(f, file_name):
+def handle_uploaded_file(file, filename):
     chunk_count = 0
-    with open(file_name, 'wb+') as destination:
-        for chunk in f.chunks():
+    with open(filename, 'wb+') as destination:
+        for chunk in file.chunks(chunk_size=8192):
             destination.write(chunk)
             chunk_count += 1