3rd party Gallery widgets

Hi,
I use either Envira or Foo Gallery for my WP photo galleries.
If I add the widget from either of these to an Elementor page the gallery doesn’t show in the designer – all I see is a place holder.
The page itself seem ok (preview shows the gallery correctly) but it makes designing a page with either of these galleries problematic.

Is Elementor not compatible with 3rd party gallery plugin widgets/shortcodes?

Thanks