Utterly baffled! Photos disappeared from DP's phone.

[MrsPeacockInTheLibrary]

My DP has a Samsung android phone fairly old in phone terms (3/4 years or so).

Went to look at photos on the phone and they have gone! Only a few files left from separate downloads. And does not seem to be in the recycle bin or whatever. Thankfully some are backed up, but not the most recent.

There is also a weird red letter N on the settings section I've not seen before.

Any technical people have any thoughts?!

I think the red letter N means the phone has had a software update and there is something new on the menu.

Has the phone got a memory card which the photos are on and for some reason the phone can no longer access it?

My phone lost a few photos recently for no reason that I can see. Does he know you're looking at his phone?

I recently moved pictures ( at a prompt ,something about memory or space) and thought they'd disappeared . I located them in "gallery" in files or folders .

Didn't Samsung cloud change to one drive or something. I'm sure dh has had emails to tell him to back up his photos to OneDrive before they get deleted