I’m trying to implement custom thumbnails and previews in my app. My extensions don’t ever seem to be run. I read through this tutorial, downloaded the code, and ran the final code sample, but it did not work for me either. I built it with both Xcode 12.3 and Xcode 12.5 beta, and I tried running on 14.4.2 and 14.5 devices and the 14.5 simulator. Neither the thumbnail extension nor the QuickLook preview are generated, no matter which scheme I run. I’m not able to trigger any breakpoints in the extensions. Do you have any idea why the sample app is not working for me?