I have just given Figma Motion a quick spin, but whenever I want to export a frame containing animations made with Figma Motion, it greys out the button for exporting, which means that I can only export my animation once. I can copy animated elements into a new frame and then I can export the frame containing animations, but that is not a sustainable workflow for creating iterations of animations and amending changes etc.
The issue is the same in the desktop app and in the browser.
Is it a bug of the Beta version of Figma Motion or am I missing something?
Export button not working:

Export button in new frame working:

