u/CMT-Lifter

Hey guys, I tried to recharge my ac myself today for the first time. I bought a can of the refrigerant from the autoparts store and the gauge was reading low. So, I followed the instructions on the can and held down the release trigger for 15 seconds. One slight increase on the gauge then back to nothing. I looked at the AC lines and saw this:
Is this the potential cause? It’s a 2015 dodge tradesman 1500 hemi.