Anima is able to export responsive interactions and breakpoints of a given frame/artboard into one HTML file (both absolute position and auto flex).
To do so:
Open the Zip file from your downloads. Find the correct HTML file and open it in your browser, when you adjust the size, the display should be responsive!
When exporting into HTML, various breakpoints of 1 screen will be exported inside 1 file, under the shortest name of the existing artboard/frame, as defined in your design. Other artboards/frames will appear separately within your Zip file.
Check out this article to learn more about setting up responsive breakpoints with Anima.
Get started with these tutorials: