Chosen Solution

My phone is xiaomi Mi5 and recently camera glass is popped out but its not broken. here is the picture of what happened : Glass and phone i still have the glass i just don’t know how to stick it back ! can i use glue ? if yes what kind of glue? what things i should know before using glue? what are other option other than glue? Thanks.

This is very risky, you could get glue on the lens but use an adhesive if you can find one, if not, then try a hot glue gun, but this should be a last resort, at this point contacting xaiomi to ask them what to do is probably the best idea