I can't use the app – Retromatic 2.0 Review

Hi, I'm having a problem with the app, I downloaded the app today at morning, but once I try to save the photo, appers a message that says: "this app doesn't have access to your photos or videos" I try to resolve the problem in privacy settings, but there isn't an option to let the app access to the photos... How can I resolve it? Thanks
Review by Sergio.mongej on Retromatic 2.0.