This might be more specific to Django than Django-Filer. Django has two settings that limit the size of file and data upload through forms.
DATA_UPLOAD_MAX_MEMORY_SIZE
FILE_UPLOAD_MAX_MEMORY_SIZE
The default limit 2.5mb. Try changing those settings to something large enough to accomodate the file you're trying to upload and see if it fixes it.
Can anyone help me fix how to upload large file (about 1GB) to aws s3 ??
i'm stucked!! Thank you.