Sorry for taking so long to respond. I don't have an iPad Pro and I can't get a hold of anyone who has one. This doesn't make a lot of sense; If it's working with your other apps, it should work with Sketch.
Can you try force quitting Sketch, restarting your device, and relaunching Sketch, to see if that helps. (To force quit, double-press the home button; a list off apps shows up; scroll over to the app and swipe up on it; that should force-quit the app.)
Let me know how that goes.
And, yes, Sketch has three layers: two photo layers and a drawing layer. When you open a new canvas the automatic default is to a drawing layer. If you'd like to first add an image, tap on the Image icon (landscape photo) in the toolbar, opens a menu that allows you to import an image (from a variety of sources). Once you've imported an image, and tapped Done, the app defaults back to the drawing layer.
It turns out that the tip was loose on my new Apple Pencil. Warning to other users...make sure the tip is screwed on all the way, otherwise it will not connect correctly to any programs. Thank you for your response Sue!
Great. I'm glad it's resolved. I just couldn't figure out the problem. Thing with Pencil is that it (usually) either works on everything or works on nothing.
Thanks for letting me know.
Interesting problem and solution! I have an iPad Pro and an Apple Pencil (and I have 53's Paper and also ProCreate), I'm going to do some testing to see if I can duplicate this. I'll let you know if I see similar results.
But, I'm glad you got it figured out! Lesson learned for us all
I've done some testing with Apple Pencil, and it definitely stops working if I unscrew the tip past a certain point. This seems to affect every app, the Pencil just stops working. It's something to be aware of! Keep the tip tightly attached...
Thanks for testing this for everyone... and posting about it.