Hi It sounds as though everything is in ‘place’ for it all to work.
Checking the card in a PC is a good idea.
By the way if you have another SD card that is ‘free’ you can insert that and format on the phone as portable/external to see if that is able to save images.
If that works then the next options would be to ensure the phone hasn’t had some ‘disturbing’ damp which may have tarnished the SD card slot contacts, the sd card is easy to clean.
You may also try starting in safe mode, which disables all custom apps that you loaded etc. On a normal restart you would then have to ‘enable’ each app with ‘signing in’.
A factory restart would be the final option as that would erase all your data.
All the best