TrueNAS Scale and Apps

Hi there

So wanting to see how easy it is to configure Apps in TrueNAS Scale, running Core + Jails atm.
Build a RC instance inside VirtualBox.
If I go into apps to install the App…
#1 selecting Plex, entering server name and pretty much clicking through, it complains about the Application Name being specified being invalid (used: “PlexServer”) ???
#2 … hmm I’m sure I saw allot more apps having been certified already, like qbittorrent ?
#3 … If I have a docker image I want to run (Unifi Controller) how do I specify it, can’t remember the guys name now, but he is always the one that releases the docker image for Unifi Controller.