Warning
An app for Google Drive support is still in development for NC 13: https://github.com/owncloud/files_external_gdrive
This notice or warning is in the doc of NC 13 .
Here : https://docs.nextcloud.com/server/13/admin_manual/configuration_files/external_storage/google.html
But I just don’t know when it will be finished . Quiet a useful extension isn’t it ?