I have added the add_filter function into my theme’s functions.php, but I am not able to alter the capabilities.
I think apply_filters is getting called in the plugin before the add_filter in the theme functions can get to it.
In testing, I dropped the add_filter function into frontend-uploader.php just before and after this line:
$this->manage_permissions = apply_filters( 'fu_manage_permissions', 'edit_posts' );
Before it worked, after it failed.
Is there a way to get around this issue?