Link and upload custom files to web page sources

In order to speed up calculations and reduce the load on the web server, I want to perform calculations on the client side. It is necessary that files with binary data be downloaded from the client and available to the script.

I’ve seen this somewhere before, how can I do this? I try various linking options, nothing appears in my sources, except for HTML, JS, CSS files.

<link rel="preload" href="js/astro/ephe/se13681s.se1" as="fetch"> <link rel='preload' href="js/astro/ephe/seas_18.se1" as="fetch">