You can add more autoembeds with plugins, maybe you find what you you are looking for here https://www.invisioneer.org/marketplace/
The best solution for clients would be an easier implementation of additional media sites just like XenForo does.
I did a little research, I guess you mean the plugin by @TDBF
There is also a version 2.0, but the DL site is down too ...
https://zaquria.com/public/d/7-website-footer-200
You could try https://www.invisioneer.org/marketplace/
If it isn't out there, it looks bad.
In that case I would recommend to switch to a plugin that is still supported.
Hi, INVISIONify is not my site and I don't get admin emails over there.
Back 2 Top was always a free plugin, you don't need a key. Simply download the latest version and install or upgrade it, that's all 🙂