Rated 5 out of 5 stars

UPDATE: This bug was fixed with version 1.2.1. Works Great!
I tried the add-on but the URL to the uploaded file was improperly formed. There was no slash after gg (before the word file) so the url had ggfile instead of gg/file.....

I couldn't figure out how to make it work correctly.

Thunderbird 78.5.1

This review is for a previous version of the add-on (1.2.0). 

Thanks for the bug report. It's fixed in version 1.2.1.