Where does tihs spare part belong

This is a true micracle…:face_with_raised_eyebrow: I opened my phone to unscrew and screw my camera (because it didn’t work agian), and then this part fell out.
But… now i closed the phone and everything works… but i know i have to add this part somewhere, but cannot find ons pictures where.
Anyone has an idea?

It’s a non essential plastic part that was previously discussed here:

If you have further questions please continue there to avoid duplicate threads.

I always have trouble finding that topic whenever this question comes up, so now I tagged it #mysterypart.