Guys, it's not youtube, this is a downloaded video, internet speed has nothing to do with it. The file is stored on my phone
jesus forget I didn't think it would be that hard to notice it in the OP.
I went back to figure out my RAM, and I'm not 100% sure on what it could be as it's not in regular settings, and since I updated my OS, I can't launch iTunes as I don't have it.
There is a bar with "capacity" and that's at 13.6 GB, with 2.1GB available. Nothing in my settings mentions RAM. Tbh, I didn't even think iPhones had that much RAM... figured it was dedicated to cookies and temporary files.