From your screen shot - "ff you proceed... will not be able to ....restore default location." That's the message I saw - that's my problem - want to go back to default and then assign to Google Drive...

Yes, It seems to have something to do with OneDrive - ounce you point it there, I don't think there is any going back, Matter of fact, I recall a popup that loosely 'may' have stated - do you want...

Steveo - nope. Added new folder, asked if I wanted to create, said yes, tried to apply - access denied.

I changed the location the of my Pictures folder from the default C:\users\myname\Pictures to D:\onedrive\pictures, Worked great until I decided to use new Google Photo on Google Drive. Using File...