Hey Sveva!

Currently, we do not support the ability to export animations created using our prototype tool. However, it looks like there are members of the Figma Community that have also shared this idea and created a plugin fullfill this request.

Here the post that may interest you (feel also free to vote up the idea so we can gauge the overall interest in the community) :

Share an Idea: Export prototype to video or gifs

check out this plugin @Sveva: https://www.figma.com/community/plugin/1170836206919391034/export-to-gif-video