Awesome, no need for the rescue @ChuckPa, your tip about the temp folder was enough to fix my problem
Same issues occuring to me were had here at the forum link below.
All I had to do was include this to my docker run command and the file started playing. Mounting the tmp folder to my operating system means plex can now execute on this folder as expected.
-v /home/user/Containers/Plex/tmp:/tmp
It’s also worth noting my transcode folder was also mounted this way
-v /home/user/Containers/Plex/transcode:/transcode
Thanks so much for the assist @OttoKerner , I am now one very happy dude
