Photo Grid quit working

Using iphone 11 Pro Max with IOS v 18.2.1. I uploaded one merged photo (2 pics into 1), then went to merge another set of photos, but Photo Grid isn't opening. The three dots on the right upper corner turn into a circle with a square, and it looks like the square is throbbing like a heart, but nothing happens. I deleted and reloaded shortcuts and photo grid. Still not working. I see this problem listed last year as well. But it was working 10 minutes ago! Any suggestions? Is there another built in option? I can't use a 3rd party app because these are private client photos.