Download full size image after opening media

Hi everyone,
I’m trying to be able to view the full size image in the media section after clicked on it. I’ve got the problem both on mobile iOS app and in web. In the config.php file the limit of preview is set at 256px to bandwidth saving reason (when i scroll in the mobile client i do not want to download gigabyte of date :upside_down_face:)
Is there a solution for my problem?

Thanks everyone for the help :slightly_smiling_face: