[switched to Deluge] OMV 4 + TransmissionVPN in docker

Hello there !
Lately, I installed Deluge to download torrents files and because of some of you, it worked well.
But I'm using a VPN on all of my devices and I'd like to use it as well for downloading torrents.
I found the haugene/transmission-OPENVPN image for docker, but I can't manage to make it work. I installed the 'non VPN' image, and it worked well, so I guess it's coming from my VPN configuration.
What is not working ?
When I add a torrent (debian torrent for the tests), it add well, but after a few seconds I have 'could not connext to tracker' error.
In the hog I have :

debian-9.5.0-amd64-DVD-2.iso Queued for verification (verify.c:269)
debian-9.5.0-amd64-DVD-2.iso Verifying torrent (verify.c:224)
debian-9.5.0-amd64-DVD-2.iso Could not connect to tracker (announcer.c:996)
debian-9.5.0-amd64-DVD-2.iso Retrying announce in 20 seconds. (announcer.c:1005)
debian-9.5.0-amd64-DVD-2.iso Could not connect to tracker (announcer.c:996)
debian-9.5.0-amd64-DVD-2.iso Retrying announce in 343 seconds. (announcer.c:1005)

Plus, when the docker is running, I cann't connect to the server via OPENVPN from outside of the LAN. Is it because the docker and the VPN go through the same connection (even if one is client and the other server) ?

Here are the settings of the docker :

If you need anything else, just ask.
Thank you !

I did setup everything according to your video : )
Local Network is set (3rd picture). I added my PUID & PGID, but sill not working : /

I don't know if I was clear, so what I meant is I only have 1 network interface and maybe this is the source of the problem.

If I should change anything here, I don't know what to do and how to do this.

I couldn't find what was the probleme nor the solution, so I switched to DelugeVPN.
Should I put the thread as "resolved" ?