Is there a preferred MPMediaItemArtwork image size? Something like "around 512 x 512"? It seems wasteful to stream and provide a gigantic image, if the image is only ever displayed as a small image.

Is there a design limit on the number of concurrent scheduled downloads? For my app I want to download as many as 30K items, each of which comes from a separate URL. How can I most efficiently do that using Background Assets? Should I schedule all 30K URLs at once, or should I schedule in batches, waiting for each batch to complete? (This is usually content the user has specifically requested to be downloaded, is there any way I can indicate that to the OS, to increase the priority?)

I'm trying to create an iOS 14 WidgetKit widget. It's compiling, but when I try to run it, on either simulator or device, I get the error below: Any suggestions on how to debug this? Details SendProcessControlEvent:toPid: encountered an error: Error Domain=com.apple.dt.deviceprocesscontrolservice Code=8 "Failed to show Widget 'com.myapp.dev.WidgetKitExtension' error: Error Domain=SBAvocadoDebuggingControllerErrorDomain Code=1 "Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)" UserInfo={NSLocalizedDescription=Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)}." UserInfo={NSLocalizedDescription=Failed to show Widget 'com.myapp.dev.WidgetKitExtension' error: Error Domain=SBAvocadoDebuggingControllerErrorDomain Code=1 "Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)" UserInfo={NSLocalizedDescription=Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)}., NSUnderlyingError=0x7fc0b0d12540 {Error Domain=SBAvocadoDebuggingControllerErrorDomain Code=1 "Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)" UserInfo={NSLocalizedDescription=Failed to get descriptors for extensionBundleID (com.myapp.dev.WidgetKitExtension)}}} Domain: DTXMessage Code: 1- System Information macOS Version 10.15.5 (Build 19F101) Xcode 12.0 (17177)