I support a pair of iOS apps that use a file provider extension. One app exposes a file provider extension, including a file provider extension service and the other app interacts with the file provider extension and uses the service.
On iOS 18.3 and before, this all works fine.
On iOS 18.4, getFileProviderServicesForItem fails when called from the consuming app with: Error Domain=NSCocoaErrorDomain Code=513 "The file couldn’t be saved because you don’t have permission." The supportedServiceSources method in the service hosted by the provider app is never invoked when this occurs. Is there some change to the mechanism for iOS 18.4 that I've not found yet?