I found this cylinder whilst I was out doing an expedition and I don't know what at all this is. I can't interact with it in seemingly any way (can't use it, can't hit it with attacks or Photon Arts). If someone could enlighten me, that'd be swell

It acts as a decoy and a healing station. It automatically attracts all enemies within a certain radius to it, and if you are missing HP and approach it, it will heal you.

OOooooh...guess that's why I didn't know what it did...wasn't missing health when I found it. Well thanks for the info and I guess I'll keep an eye out for em when I need em now