The are all in the photo app, in albums.
Thank you for that very prompt reply. Much appreciated.
I think the problem is on the FB side. If you are uploading correctly, as you seem to be doing, and if you do eventually see all the pictures in FB, then my guess is that FB caches them and then takes its time to process them.
This is a recognised issue if there are lots, really lots, of photographs and may take longer if there are any videos.
I have friends who post literally 100+ photographs at one go and they often talk about delays. In fact, in some cases the pics have appeared in consecutive posts rather than in one single one.
Best I can suggest at the moment. Other members may have other ideas.
Ian