I use Xcode 14 Beta to create a Background Download extension target for a simple test. But none of the extension callbacks is called after I install the debug version or ad-hoc version. I've checked the system console log for detail research but found nothing. Is there any debug tool to trigger this mechanism or sample project I can test?

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?)