For some reason, my camera won’t stay in the target position. Please help!

You can create a separate blueprint camera or player for the note, so when you interact with the note you can possess that camera which doesn’t move or does anything, and when you press back button you go back to possessing your main player.

Probably there would be much better method to solve this but i have done things like this in my projects, and this works for me all the time.