Flanimate canvas projects will always produce, at a minimum, an HTML file and a JS file. That's just how it works.
If your client can't deal with assets that consist of more than one file, well... wow.
If you look in the HTML you will see a line similar to this:
Go into the 'youranim.js' file and select all, copy. Come back to the HTML, and change that line to this:
<script>paste your clipboard contents here</script>
You now have just an HTML file, you don't need the JS file anymore.
The above assumes that it's all vector animations. If you have used images, they are going to be in an images folder.
Ok, I'll try that, thank you very much!