Trobules with permission folder

Hi everyone!

I have some troubles with the permissions of my folders. I installed syncthing through Casa OS and I build an RAID unit which I called like “md0” and I mounted it in /mnt/md0, and I created a route in /mnt/md0/RAID/, but when I’m trying to add this folder in UI syncthing, the UI give a message saying “permission denied”, and I have given permissions to this folder by chown -R user:group but I can’t add this folder in syncthing. I’m using raspberry pi OS.

Thank you very much for your help

There are plenty of previous threads with various advice to simillar problems. Suggest you use the search first.