IPhone 7 back camera and flash not working. Any help? Anything's appreciated?

My iPhone 7 back camera and flash have not been working for about maybe 2 weeks. When I open the camera app, there's just a black screen and when I press the button to take pictures nothing happens. Also when I turn on flash in the control center, the button turns on as if the flash was on but nothing happens either. I've already tried switching cameras, turning off voiceover, restarting the phone, erasing all settings and data and updating the phone and nothing has worked so far. It is starting to become a problem now since it has been so long and I haven't been able to take any videos, pictures, or even use flash. Any idea on what's wrong? Any help is appreciated.

Apps on Iphone won't move?

Ok so when I try to move my apps on my phone it starts to glitch out and like gets stuck and glitches my home button and then i have to turn the phone off and on again

Have ads ruined youtube?

I just saw some guy on youtube remarked on a beatles music video ' wow ads have ruined youtube'.

is this true? I use adblockers on my computer so never see them, never see ads… But i do see many ads when using youtube on my iphone.

if ads have ruined youtube, what can be done so you don't see the ads apart from use adblockers?

id appreciate any thoughts on this.

How do you find the OTG compatibility.for an Iphone to know if a dual USB Flash Drive will work?

I plan on saving pictures from my Iphone AND my laptop to a flash drive. Seems must of these dual flash drives state they work with Android (ones that say smartphones, when you look at the actual compatibility list it does not have Apple as one of the brands). I found a dual flash drive by SanDisk but they have a blurb on their compatibility if your brand is not listed to check your brand's OTG compatibility. I just want an inexpensive one of these dual flash drives (64gb or more). Didn't realize it's such a hassle to search since I can't find any site that can narrow the search to ones that you can use with Iphones.