Delete files without editing the model

[henryavila]

I'm implementing a disk quota restriction per user.
When the quota is reached, the user can't upload new files.

The problem is that to remove an file, the user must enter in edit mode, but once in edit mode, I can't block the user to upload a new file.

So, if I block the file field on edit, the user can't delete file, that is needed to free space and be able to send new files.

The insert and delete file are in the same screen and there's no way to block just one or another