@TupeloHoney I run Pixel 3A XL, and do not experience the issue with the flashlight, to answer your question. I'm a newbie to it though, so I cant really give advice to fix it.
@AppLee @TupeloHoney Yeah Android users too have issues with Iphones, I remember not being able to receive images and group texts would send to people indavidually instead of to them. For whatever reason, sometimes android ships with MMS off by default, so I am wondering if it would be the same case for UT. I cannot test this easier or say for sure, beacuse I only installed a week ago and do not have a compatible carrier (Verizon, sadly not working. Supports GSM Only), but maybe it has the same issue as android phones. I recall seeing an MMS option somewhere, otherwise @wally seems to know a bit about what he/she/they are talking about.
IPhones are definently natorious to cause compatibility issues sometimes, atleast for me. if there is a setting that's slighly different, the IPhone may freak out and just do something stupid and unexpected. Usually on most devices given that the OS has enough options to tinker with I eventually figure it out. Good luck!