What I tend to do, especially on the Octatrack, is to create the simplest setup possible and check along the way to make sure things are still correct.
So, I’d pull any MIDI cables from the OT, mute any unused tracks, set up your triggered sampling like you did, watch it sample, then press stop. Delete the on-shot recording trigger, double-click the track button where the sampling took place, do function+bank (edit) to see the sample, press function+yes to play the sample, and if everything is still good there, then go back and start re-adding the pieces you took away (unmute tracks, plug MIDI back in, etc).