It only supports Netusbee/Ethernec type rom port solution.

I recommend Chrome because it allows drag and drop of entire folders while Firefox only allows to drop a single file or a flat list of files.

As for drag and drop of directories, this is possible and already supported only by Chrome which provides APIs capable of that.

You can upload entire folders already, just drag and drop multiple files. Additionally, Chrome allows you to drop entire folder trees.

UIP has issues transferring zero byte files. Zero size files issue is a bug I'll fix in a new release.

Directory creation doesn't work yet. It only requires some minor work in the UI but embarrassingly I haven't got around to that.

There's no download button. You just simply click on a file name and it will download like on any other web page.

Static IP is planned. I'm also thinking about ACC version, but currently don't know if this would work.