Did you make any progress on this issue?

You're asking two distinct frameworks (ARSession and AVFoundation) to access the camera at the same time. Look at using the ARSession.currentFrame.capturedImage property for the RGB data.

I don't know anything about the specific messages you're seeing, but… Instead of storing "super long strings" in a field of type String, store them in a field of type Binary Data. Also, consider the "Allows External Storage" option.

I recommend enabling all the debugging support for Core Data in Xcode. See here for more… https://useyourloaf.com/blog/debugging-core-data/ most often, a crash during save means you created an NSManagedObject in one context, and tried to save in another context. Also, you should be doing a save within the thread owned by the context, like this context.perform { // load objects // make changes try context.save() }

research NSPersistentHistoryTracking

maybe your app has enough users hitting CloudKit at the same time that its tripping over the rate limit?

is "iCloud Drive" enabled?

check this out https://developer.apple.com/documentation/mediaplayer/mpmusicplayerapplicationcontroller/2815055-perform