High-quality playback and reliable offline downloads (paid version required). Android/iOS Dedicated app for downloading and playing music offline. Desktop and Web Downloads
Before users can download content, the server administrator must grant explicit permission within the Jellyfin Dashboard . Log in to your Jellyfin server as an . Navigate to the Dashboard and select Users . Select the user you wish to edit.
Under the tab, ensure the checkbox for "Allow media downloading" is enabled. Downloading Content on Mobile Devices