omega44-xt
Gear up ...
What do you mean mount a folder in system?Did you try rclone? You can mount a folder in your system for it.
You can keep Onedrive folder in a different drive, problem is files inside it doesn't work very smoothly when I tried it. Random issues at times. Maybe keeping it in SSD will help, but I don't want to commit my SSD to saving docs & pics totalling about 100GB+.