Rclone is a CLI based program used for syncing files and directories from various online storage.
If you want to setup Rclone with gdrive, follow the guide at Rclone mount with google drive
If you want to setup rclone with gcache, follow the guide at Rclone cache
If you want to know how to use rlcone mounts with plex, follow the guide at Plex with rclone
Troubleshoot section Troubleshooting rclone