Wacom Bamboo stylus pressure not working in Photoshop on iPad (iOS mobile app)

Just got a Bamboo stylus so I could draw remotely using cloud PSDs and have them instantly available on my desktop for work purposes. Unfortunately, it seems the pressure levels aren't working in the Photoshop mobile app. It detects the pen tip and draws, but no pressure variation. I tested it in other Adobe apps (specifically, Adobe Sketch) and it works perfectly, so I know it's not a hardware issue.

I've tried different brushes and flipped toggles for "Use pressure for size" and "Use pressure for opacity" and nothing changes. I did see in Sketch that you had to link the stylus first, but I don't see any way to do that in PS. Am I missing some way of syncing the stylus or some other setting, or is this just not supported in PS on iOS yet?