I can't paint with either my pen or my finger. If I press REALLY Hard on the pen, it will make a line. Also, when I make the layer larger, it does not draw, it just moves with my pen or finger. It worked better earlier. I have latest iPadOS on the original iPad Pro and the original Apple pencil
Sorry about the trouble working with Photoshop on your iPad.
Regarding painting with your Finger, if you're outside of a document, and you goto the App Settings (Gear) > Input -- Is "Stylus Only Painting" enabled?
Regarding pressing hard before a line shows - Which brush are you working with? Double-tap the brush icon to get different brush options, do you have the same difficulty painting with a simple Hard Round or Soft Round brush?
Will probably need more info around the enlarged layer moving around issue. Can you provide anymore detail on that? or perhaps a screenrecording?