Fortnite mobile sound bug how to fix?

I have been having issues with Fortnite Mobile sound lately. When I play Fortnite I have no sound, the sound only works if someone in my group is on voice chat or if I use headphones. This is also the case with other games as well as pubg mobile. Everything works normally at yt. I have an Apple iPad, does anyone know who can help me?

I also have an iPad, the best thing is to ask Apple Support on the Apple website

You only have to swipe your notification center down once and up again. But not entirely, but only 15%, until the battery display is covered, about 15% of the screen!