Can’t grant camer permissions after denying

When I was making a post it asked me if I wanted to grant camera permissions on my iPhone. I made a mistake and selected no. Since then, I tried to upload a pic on another post and it just shows a black image on camera and shows only an image I already posted on feed. The app should ask user with a pop up if user wishes to ré-allow three app to use the camera. We can’t expect users to go deep into settings to re enable camera use from the app in the iOS settings. They’ll abandon and stop using app before figuring out what to do.