creationRequestForAssetFromVideoAtFileURL for slo-mo

We are doing some processing over user videos and saving them as separate asset into Camera roll via


[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *creationRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:renderedContentURL];
...
}];

All goes weel for usual videos but performChanges fails everytime when slo-mo video (FPS > 100) is created.
What is the right way of saving slo-mo videos into camera roll?