This scope lets an app "View files shared in channels and conversations that your slack app has been added to"
This OAuth permission scope works with these Web API methods and Events API events.
files.info - Gets information about a team file.files.list - Lists & filters team files.file_change - A file was changedfile_comment_added - A file comment was addedfile_comment_deleted - A file comment was deletedfile_comment_edited - A file comment was editedfile_created - A file was createdfile_deleted - A file was deletedfile_public - A file was made publicfile_shared - A file was sharedfile_unshared - A file was unshared