Custom push notification sounds outside main bundle

Hello!

In application I'm developing I have a requirement that user can customize push notification sounds server-side. I checked it documentation and it states that
"The sound files can be in the main bundle of the client app or in the

Library/Sounds

So I'm putting sounds I download from back-end to this subfolder in Library, which I create like this:

+ (NSString *)soundFolderPath

{

NSString* path = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];

path = [path stringByAppendingPathComponent:@"Sounds"];

NSLog(@"%@: Path to sounds folder: %@", [self class], path);

return path;

}

- (void)createSoundsDirectoryIfNeeded

{

NSFileManager* manager = [NSFileManager defaultManager];

NSString* path = [self.class soundFolderPath];

if (![manager fileExistsAtPath:path])

{

NSError* error = nil;

[manager createDirectoryAtPath:path withIntermediateDirectories:NO attributes:nil error:&error];

if (error) {

[self handleError:error];

return;

}

}

}

But when I send push notification, while app is in background - it plays default notification sound instead of a custom one. I've checked data container of the app - files exist and are in the correct folder. File format conforms to what is described in documentation and I even added those sounds as resources to bundle and that way it actually worked.

I can't find a solution to this and at this point I'm wondering if it's even possible.

Can someone help me with this?