Thanks Ron P.!
I was able to watch the Serif's tutorials Mask Layers video just ONE time, then tried the Masking vs Clipping Layers but I keep getting an "Affinity Photo for desktop tutorials" page but the video does not render. I tried going back to the Mask Layers video, but now that one won't play either. I tried accessing both videos again with my VPN off, but that also did not solve the problem. Must be a mysterious cookies thing or something wrong with my browser settings/brand.
Anyway, I watched the Mask Layers video you sent all the way through and I think this is just the video I needed to complete my project of merging a pair of red-shouldered hawks on separate trees onto one tree so they are not so far apart and look adjacent to each other on the same tree.
I've been trying to get the two hawks in the same shot for a couple of years when they visit our yard, but naturally they are never cooperative enough to take their photo together on the same tree...so I can blow it up big for my living room focal point photo artwork.
Thanks a ton for your guidance!
I'll try to find those same two videos on YouTube next...... ~Jeff at JSJ Photography