Sending photos in Facebook Messenger app

I’ve found this morning that I’m not able to send any photos via the Facebook Messenger app... but only photos taken (or saved to my device) today. Anything in my camera roll from yesterday (20th Nov) or earlier sends just fine. I’m having this issue with both my iPhone XR and my iPad Pro. Restarting the devices makes no difference - still getting a “couldn’t send” message in the app.