I tried to create a connector for google drive folder which has subfolders. However when you try to share a folder which has subfolders, it is not possible to connect. I get the message:
Connection tests failed.
Connecting to Google Drive: Folder is not shared or does not contain any files with supported format. Please share the folder with Fivetran service account and add some files into it.
I checked Fivetran documentation for confirmation and you do not support google drive folders with subfolders (https://fivetran.com/docs/files/google-drive#googledrive).
It would be really useful to have this feature since in general when a user connects with googledrive they have many subfolders (and subsubfolders) and it would be better to only connect to one folders instead to have to do the same procedure for each subfolder.