For set up of Google Client ID and Google Client Secret, your ‘gridgallerys’ URL to the documentation (Read online document) is not a working link or domain.

I tried spelling ‘gallerys’ correctly as “galleries”…doesn’t work. I tried just the domain itself, without the ‘document’ path…nope.

Your plugin is showing as up-to-date from within my wordpress. Why not include some instruction in the plugin and/or on your support pages so we can make it work with google drive content, being that it is one of your listed features of the plugin?