As of recently, I'm unable to change (add/delete) my own photos for the wallpaper. When I try to delete some of my photos, they stay; when I try to add any photos, I can't select any, let alone a group of my photos from Onedrive.
I'm on 6.210504.0.96911 and I'm regularly checking for updates. There doesn't seem to be any newer build. If there is, where can I find it? In the meantime I have restarted my phone and that seems to have cured the problem. Thank you for your prompt response.