Upload your own files, or link to files on the internet from within the app or the file/link itself.
Only Administrators and Editors can upload, edit, or delete files. Editors can only delete files they uploaded.
Add Files within the App
From a Media item or Song, select the Files tab, then tap + Add File. You can add files to media item, a song, a song arrangement, or a single key within a song arrangement.
Any media that you attach to a media item in the mobile app must be added to the Media library in the web app first.

Chose the method to add file or photo from your device or attach a link to the item.

Name your file, and check the Attach To section to verify the file is being uploaded to the correct place.
Tap the Save icon to upload to add the file to the item.

The file will show in the attachments section of the item.
Tap the Options menu for the file to edit the file name or delete the file.