I feel that winscp is lying to you. How’d you mount that path in the docker lxc? Proxmox GUI?

By the way I’m just encouraging you to keep on going. Permissions from the host to an lxc to a docker is a huge pain in the butt but really is the right way to do it and folks should not run privileged containers.

If you are running your docker in an unprivileged lxc (which you should be) proxmox is going to change the UID/gid to a low number.

I’m assuming that in the docker lxc you correctly mounted /mnt/plex and you can touch/remove files on there? If not, your folder mount is wrong to the lxc.

If you can, and are using docker compose, there is probably an environment value to set the UID/GID of the user for jdownloader. Set this to root or some other user that has the right access on your lxc.

Damn, just downvote and move on.