Hi Alex,
I was doing this in the project area, not the trigger area, I didn't try in the trigger area. I installed the plug in a couple of days ago on a new build machine via the jenkins UI, so it downloaded the latest version I assume - it had an extra option to compress the build log which the version that I have that works does not have. I have copied over the older version from a machine that I have (the jpi folder and the plug in folder) and it now works. Not exactly sure how to find out the version number, but at a guess I would say 2.25 works, and after that it doesn't work for me.
Can you be more specific on what you consider the "current" version? Also, are you doing this in the project area or trigger area? Screenshots and whatnot are very helpful.