Hello! Why doesn't your slider is not subject to editing? I don't see how I can manage it. As for OS Gallery it's wonderful I have no problems. as for slider - I don't see now any reason to use it
Our Joomla slider
, Is frontend edit slider.
You add/edit your slides from frontend. This created special for you see exactly what will see your clients.
In admin area you only:
- Publish slider module to some posittion,
- go to frontend,
- login as admin user
- and start add your slides
Please check video how start work with Joomla slider
Please check Joomla slider documentation