Using kPasteboardTypeFileURLPromise/kPasteboardTypeFilePromiseContent

gistfile1.m

- (NSArray *)writableTypesForPasteboard:(NSPasteboard *)pasteboard {
	// pasteboard must be stored away because there's no way to get it in -pasteboardPropertyListForType: :(
	_currentPasteboard = pasteboard;

	NSArray *types = @[(id)kPasteboardTypeFileURLPromise, (id)kPasteboardTypeFilePromiseContent];
	
	return types;
}

// ...

- (id)pasteboardPropertyListForType:(NSString *)type {
	if ([type isEqualToString:(NSString *)kPasteboardTypeFilePromiseContent])
		return someUTI;
	else if ([type isEqualToString:(NSString *)kPasteboardTypeFileURLPromise]) {
		NSURL *directoryURL = [NSURL URLWithString:[_currentPasteboard stringForType:@"com.apple.pastelocation"]];
		NSURL *finalURL = [NSURL URLWithString:[_filename stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] relativeToURL:directoryURL];
		
		// Write your file to finalURL here
		
		return [finalURL absoluteString];
	}
}

I can't get a hold of com.apple.pastelocation — anything I could be doing wrong?