I just switched to Paperpile to try and be rid of an issue I have been having with a different reference manager, and I have run into the exact same problem again! When I try to insert a citation in Google Docs (either with the drop-down or the keyboard shortcut) I get the google docs “insert link” dialogue (accessible through “Insert > Link” or CTRL+k). This can be seen here - Imgur: The magic of the Internet (not my image - taken from the support forum for the other reference manager).
Any help would be greatly appreciated! According to the academic curse this all broke very shortly before a deadline, and I still don’t have a way to insert new citations or modify the citations in my document!