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I'm happy to help fix this for you, if you theres a way to fire up the project locally? Having the same issue.
pascalo-
There is not. Even our version of Django is very much out of date.
This is the JS that uploads attachments: https://github.com/microcosm-cc/microweb/blob/master/core/static/js/attachments.js
This is where it hooks into the HTML: https://github.com/microcosm-cc/microweb/blob/master/core/templates/forms/block_comment_box.html#L39-L80
And this is one of the templates that pulls the above together: https://github.com/microcosm-cc/microweb/blob/master/core/templates/forms/create_comment.html#L94-L99
Thankfully the JS is self-contained enough that it should be fixable without even running the whole site.
I've had this bookmarked for a few years: https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications and suspect there's a cut and paste solution from that page.
Velocio
The JavaScript on this site is 8 years old... browsers have moved on and the site has not.
I should fix it, but I don't yet know how and it's remained a very low priority for me for a long time.