Wallpaper or Lock Screen whichever it is I don't want it!

[Members_uFrovq5]

First, I have to admit to not understanding the difference between Wallpaper and Lock Screen.  That doesn't make it any easier to solve my current problem.

On my S10, I have for a long time had a family group photo showing when I first started the phone.  (Is this the 'wallpaper'?).  Only when I tried to use a different photo did I hit an amazing problem.  After tinkering with Settings I now see (sometimes) an old photo that I took some time ago and is thoroughly unattractive, and which I don't want to display, or even keep; it alternates with one that I am happy with.

Here's the real puzzle.  The photo I am happy with comes from my Gallery, but I cannot find the 'bad' photo anywhere on my phone!  Except when it pops up, unwanted, from time to time.  This is hair-tearing stuff.  How can I stop it happening, and how can I get rid of a photo that I can't find?

[papashaun]

Could try Settings - Themes - tap on " My Stuff " button at top left hand side, then tap " Wallpaper " tab. See if the photo you want rid of shows in there - if so tap and hold on it to select it then tap the delete icon at the bottom

[Members_uFrovq5]

Thanks for the suggestion, but the picture doesn't appear there

[papashaun]

Sorry it not work - only other things I can think of is 1) maybe check your downloaded files in case it is lurking there or 2) re set your wallpaper to a default one, then reset it to the photo you want. ( The Lockscreen is the screen that shows when you turn the phone on - and the Homescreen is the one you see with your apps etc after you unlock the phone with your fingerprint or pin code )