We did try to attach a Gdrive link to one our tickets for the first time. The extension of the file does change to "docx" after the link is accepted and the extension of the downloaded file has to be changed to its original format ( mp4 in our case) before using the file.

PS : Please move this problem report to the "Zoho Desk" community. I did select "Zoho Desk" when sending it but it did somehow end up in here.