Files

https://www.files.gallery/

https://demo.files.gallery/

Files is free to use with basic features. To remove the license-popup and unlock additional features, you may purchase a license [$39] from within the app.

https://news.ycombinator.com/item?id=30233635

Alternatives

A few alternatives have already been mentioned here; yet another one: https://larsjung.de/h5ai/ reply
My favorite one for years of sharing files. This dev also has others cool tool. Check it out on his Github page https://github.com/lrsjng

I used https://github.com/Jack000/Expose a couple of times. Advantage: it generates a static site. Disadvantage: it must be customized almost certainly. It’s a bash script.

I use https://sye.dk/sfpg/ myself, another single-file PHP photo gallery. It’s less polished, but it’s free.

What is Files app?

Files is a single-file PHP app that can be dropped into any folder on your server, instantly creating a gallery of files and folders. It supports all file types and allows you to preview images, video, audio and text files.