The issue occurs on Desktop app as well, so I doubt it has anything to do with it since it does nothing for me even after everything is updated.
I think this is just a connectivity issue with Evernote which is the reason Cloudflare WARP fixes it.
I tried that on my Samsung Galaxy M51 but it doesn't fix anything for me.
Even to sync my notes on both my PC and Android, I need to enable Cloudflare WARP, once it's synced, I can disable it.
I have two notes which contains 1 image with decent resolution size but their actual file size is very small.
But, notes with no image also aren't loading.
Edit: Notes only loaded after I tried opening it with Cloudflare WARP enabled. Now it is loading even after I disable it, weird.
Unfortunately, this issue happens to me always for Android.
I have already tried what you suggested and even more, none of them helped.
Yes, I can also see the note preview in the note list.
I'm having the same issue on Android, the notes when opened shows the loading for a long time and it then says Notes Unavailable.
I've tried going back and re-opening it, cleared app data/cache but it refuses to load my notes.
There is no issue on the Windows app and the web app.
In the Windows version of Evernote, under text formatting options, the highlight is default yellow and there's no option to select the highlight color whereas in the Web version of Evernote, you can change the Highlight color.