WP Form lite plugin is now compatible with AMPforWP and it requires WP Forms for AMP Extension.

What features are compatible at the moment?

1. WP Form lite Plugin Compatibility with our WP Forms for AMP extension.
2. Input type=file Support.
3. Added a symbol when form is under processing
4. Forms submission support

If there is any feature from the WP Form lite that is not available, then you can request it from this support page.