limiting upload_files

I found the answer here: https://www.itsupportguides.com/wordpress/wordpress-how-to-make-media-library-only-show-current-users-images/

This works for me
add_filter( ‘ajax_query_attachments_args’, ‘show_current_user_attachments’ );
function show_current_user_attachments( $query ) {
$user_id = get_current_user_id(); // get current user ID
if ( $user_id && !current_user_can(‘manage_options’)) { // if we have a current user ID (they’re logged in) and the current user is not an administrator
$query[‘author’] = $user_id; // add author filter, ensures only the current users images are displayed
}
return $query;
}