YES!! Thank you so much! That was the information I was missing to understand why my photos were coming up differently in between apps. I kept trying to send photos to people from the Photos app, which left me with the lower quality. Disappointing, but *most* photos were fine with that quality.
I found that, in Affinity, I can click SAVE with the option save the layers and that will send my edited photo over to the Photos app, but if I EXPORT the photo from Affinity AS a .TIFF file and save in a separate place(like a desktop folder), I can upload .TIFF files to GooglePhotos and it preserves the quality(no soft, blurry faces!).
Thank you everyone for your help! I'm still learning how to edit properly, so I don't do a lot the "easy way" with editing. Knowing that my unnecessarily challenging edits aren't also being wasted by a low quality save job is keeping me from a lot of tears. I really do appreciate it! 🙇♀️