I have two mounted disks, /mnt/sda1 and /mnt/sdb1. In my transmission settings, the download path is set to /mnt/sda1/download, and when I download a torrent, it downloads and saves the files to this location. However, when I try to choose a different path (/mnt/sdb1/download) for a new torrent, it gives me an error saying that the path doesn't exist. If I change the download path in the settings to /mnt/sdb1/download, the new torrent downloads and saves to the second disk, but the first disk (/mnt/sda1/download) stops working. How can I download torrents to different folders without changing the transmission settings?
Are the permission the same for both download directories? Not using Transmission myself on OpenWrt, does it run as a specific user? But in general it should be possible to choose a download folder when adding a torrent.
What client are you using to add a torrent? transmission-cli, a remote transmission client or the web interface?
Addition: In a x86-64 VM with two RAID disk I gave transmission a go.
2nd folder I tried: /mnt/md1/transmission/done
Summary: Transmission does run in ujail and adding a torrent with a path different to the one in /etc/config/transmission will be blocked (by ujail I assume). Of course the 2nd folder is not in the list of allowed directories of ujail.
Is that the same for you, does it run in ujail too?