We can‘t access your video.
The better way: Post your video on YouTube and give us the link, or explain your issue here, use Dropbox to upload your small(!!) .muse file and post a valid and tested download link here. A .muse file will be necessary to assist you.
Breakpoints work in Muse when I use the slider. They do not work in preview mode.
We are missing a link to download the .muse file. And we don‘t know, what exactly „is not working“.
The only thing, which we can see is,
Are you aware of the fact,