I'm looking for something that sounds incredibly simple, but I can't seem to find a plugin that actually does it.

Here's what I need:

• One central dashboard on the main site to manage banners, images, or custom HTML.
• Ad placements across multiple sites in a WordPress Multisite network.
• Centralized control — update the content once, and it automatically updates across all sites.
• Simple integration — ideally using shortcodes, widgets, or predefined ad placements.

Basically, a lightweight ad management plugin, but built specifically for WordPress Multisite.

No complicated ad server, no external platform, no unnecessary features. Just a simple way to distribute and manage promotional content across a network of websites.

Am I missing something obvious?

Surely I'm not the only one who needs this?

Has anyone found a plugin that does exactly this? Or is this genuinely a gap in the WordPress plugin ecosystem?