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« on: Sunday 16 March 25 12:54 GMT (UK) »
You say "Windows 11" and then talk about a tablet. Are you running W11 on a tablet? What kind of tablet ? What device are you running W11 on? What program do you use to view PDF files ? What program do you use to view Photos?
"....no idea why they changed from jpeg to pdf in the first place...." - what is THEY in this sentence - a file, a setting ? I'm sorry, but finding your description hard to follow.
You talk about a recent update - do you know which update (they have numbers beginning KB....), you can find this in your Windows Update History Settings. If you feel it was a bad update, you can often remove it. If this was a general problem with a bad update I feel many others would have same symptoms.