create_resource using APi lacks file_extension parameter

[Kris Muylaert]

I'm trying to upload an image using the api.

Create_resource succeedes, but upload_multipart fails with the error: 'Banned extension'.

Which is in some way correct since on the datanse file_extension of the resource record is empty.

But via the api it is not possible to pass the file_extension.

Any help on this?