Hi Abylander and Meitar,
I think I figured out what happened here. The same thing happened to my google sheet, and then I changed the setting in google docs.
1 – Go to share settings
2 – Click on advanced
3 – Make sure to unclick disable options to download, print, and copy for commenters and viewers
4 – Click save, the google docs login should not appear
Sincerely
Jon
