Adding a document from Google Docs doesn't work anymore

Adding a document from Google Docs doesn't work anymore

Hello.

Adding documents from Google Docs worked well up to last week.

Then i've been trying to "upload" a Google Docs document to my projects documents with no success.
The problem is that i can choose a document to "upload", it appears in the list, but when i click "Upload file", Zoho says:
 "File with zero size cannot be uploaded".
It seems that it wants a filename in the "
Select file* :" field, but it must not ask it if i've already chosen a google's one, doesn't it?

Thank you.