File Transfer Format isses

I am a psychologist in private practice. One thing I have been enjoying is the ability to transfer with my office admin the backup file for my accounting software. we have been doing this for weeks and all of a sudden doxy is telling me that it doesn’t accept this file format. what is going on here and how do i get this ability back?

this is critical for my business and am upset that this changed.

I have the same error message. But patient can transfer files to me.