all my notes disappeared from iphone 11 this morning

Turn Notes off and back on again. Then give them time to download. I read something somewhere that Notes was something that was doing this with the latest update. I'll try and find the link and come back and post it.

Here you go. https://www.macrumors.com/2024/11/07/how-to-fix-iphone-notes-disappearing/

Open the Settings App

Tap your name at the top, then tap iCloud

See if Notes shows and if the switch is turned on, if not turn it on

turn on and off notes.

go to iCloud -> notes --> turn off sync (it will ask to delete from iPhone) press on it and turn it back on to solve your issue.

It is on and they are all gone I am FURIOUS