Footnotes plugin is compatible with AMPforWP. It does not require any 3rd party addons to work with AMPforWP.
What features are compatible at the moment?
- Allows Superscript layout.
- Allows Mouse Over Box.
- Support the Hyperlink Symbol in the Reference Container.
- Gets connected with Collapse references by default option.
If your required Footnotes feature is not available, then you can request it from this support page.