Thanks for posting your question here. I'm sorry you are having issues with the app. I would recommend you to delete the black photos and try the transfer again. Before you start the transfer please start the 'Photos' app and then our app to make sure that the photo database is up to date. If you continue having issues please tell us what type of photos (format) you are trying to upload and if they are in very high resolution.
I hope this helps. Let us know if you need more help.
Bugs
Thanks for posting your question here. I'm sorry you are having issues with the app. I would recommend you to delete the black photos and try the transfer again. Before you start the transfer please start the 'Photos' app and then our app to make sure that the photo database is up to date. If you continue having issues please tell us what type of photos (format) you are trying to upload and if they are in very high resolution.
I hope this helps. Let us know if you need more help.
Kind regards,
Enrique
Photo Transfer App