It seems that PDFPageOverlayViewProvider is set in the UIViewRepresentable of PDFView derived from class Coordiantor: NSObject. I wander why Apple doesn’t provide the demo App presented in the video. Maybe, the protocol is not working yet in the beta version.

Nope. I wander if it is possible to roll back to iOS / iPadOS beta 5, but I do not know where to download beta 5 ipsw.

/Applications/Xcode-beta.app/Contents/Developer/usr/bin/cktool

CoreData: CloudKit: CoreData+CloudKit: -[NSCloudKitMirroringDelegate _scheduleAutomatedImportWithLabel:activity:completionHandler:]_block_invoke(2775): <NSCloudKitMirroringDelegate: 0x28326c0c0> - Finished automatic import - SandboxImport - with result: <NSCloudKitMirroringResult: 0x280722dc0> success: 0 madeChanges: 0 error: Error Domain=NSCocoaErrorDomain Code=134410 "(null)" UserInfo={NSUnderlyingError=0x280987db0 {Error Domain=CKErrorDomain Code=36 "CKInternalErrorDomain: 1028" UserInfo={NSUnderlyingError=0x2809a7900 {Error Domain=CKInternalErrorDomain Code=1028 "Account temporarily unavailable due to bad or missing auth token" UserInfo={CKErrorDescription=Account temporarily unavailable due to bad or missing auth token, NSLocalizedDescription=Account temporarily unavailable due to bad or missing auth token, NSUnderlyingError=0x2809a69d0 {Error Domain=CKInternalErrorDomain Code=2011 "Couldn't get an authentication token" UserInfo=0x2812a2200 (not displayed)}}}, CKErrorDescription=Account temporarily unavailable due to bad or missing auth token, NSDebugDescription=CKInternalErrorDomain: 1028, NSLocalizedDescription=Account temporarily unavailable due to bad or missing auth token}}}

CKErrorDescription=Account temporarily unavailable due to bad or missing auth token