Pages.app like moveToURL:completionHandler: impl. NSIsRelatedItemType key in Info.plist is required

Document.m

- (void)moveToURL:(NSURL *)url completionHandler:(void (^ __nullable)(NSError * __nullable))completionHandler
{
    NSError *error = nil;
    NSURL *adjustedURL = nil;
    if (![[url pathExtension] isEqualToString:@"testextension"]) {
        adjustedURL = [url URLByAppendingPathExtension:@"testextension"];
        
    }
    
    NSFileCoordinator *coordinator = [[NSFileCoordinator alloc] initWithFilePresenter:self];
    [coordinator coordinateWritingItemAtURL:url options:8 error:&error byAccessor:^(NSURL *newURL) {
        NSLog(@"newURL %@", newURL);
        
        BOOL isReachable = [newURL checkResourceIsReachableAndReturnError:NULL];
        if (isReachable == NO) {
            [[NSData data] writeToURL:newURL atomically:NO];
        }
        
        [coordinator itemAtURL:newURL willMoveToURL:adjustedURL];
        
        
        if (isReachable == NO) {
            [[NSFileManager defaultManager] removeItemAtURL:newURL error:NULL];
        }
        [coordinator itemAtURL:newURL didMoveToURL:adjustedURL];
        
    }];
    
    
    NSString *fileType = [self fileType];
    [self saveToURL:adjustedURL ofType:fileType forSaveOperation:0x1 completionHandler:^(NSError * _Nullable errorOrNil) {
        
        [coordinator coordinateWritingItemAtURL:url options:0x1 error:0x0 byAccessor:^(NSURL *newURL) {
            
            NSError *remvoeError = nil;
            if ([[NSFileManager defaultManager] removeItemAtURL:newURL error:&remvoeError] == NO) {
                NSLog(@"remvoeError %@", error);
            }
            
        }];
        
        
        
    }];
    
    NSLog(@"error %@", error);
    
    
    [self performAsynchronousFileAccessUsingBlock:^(void (^ _Nonnull fileAccessCompletionHandler)(void)) {
        
        [super moveToURL:adjustedURL completionHandler:^(NSError *moveError) {
            
            completionHandler(moveError);
            fileAccessCompletionHandler();
            
        }];
        
    }];
}

Info.plist

	<key>CFBundleDocumentTypes</key>
	<array>
		<dict>
			<key>CFBundleTypeExtensions</key>
			<array>
				<string>testextension</string>
			</array>
			<key>CFBundleTypeIconFile</key>
			<string></string>
			<key>CFBundleTypeName</key>
			<string>DocumentType</string>
			<key>CFBundleTypeOSTypes</key>
			<array>
				<string>????</string>
			</array>
			<key>CFBundleTypeRole</key>
			<string>Editor</string>
			<key>NSDocumentClass</key>
			<string>Document</string>
            <key>NSIsRelatedItemType</key>
            <true/>
		</dict>
	</array>