Hi,
Have you checked if anything you have written using "screen off memo" is in '''Samsung Notes''' at all?
This is from the [https://content.etilize.com/User-Manual/1038281895.pdf|User Guide] p.162
" ''Screen off memo: Create notes by detaching the S Pen while the screen is turned off and then writing on the screen''. '''Screen off notes are saved in Samsung Notes.''' "
You can browse notes you create. From the ''Home'' screen, tap ''Apps > Samsung Notes''. Browse note entries by swiping up or down. To search for a note, tap Search.