You might want to check out the DoCast Screen Mirroring app. I had the same issue with my old mirror app becoming incompatible after an iOS update, and this one works perfectly for me. It’s pretty straightforward and reliable for quick checks before video calls. You can grab it from the App Store. Here’s the link to the app: Get DoCast on the App Store.
It not only mirrors your screen but also has a simple interface, making it easy to use. Plus, it's free, which is always a plus! Hope this helps.
5 Likes