i found one on fdroid but it was old and the directory selector was broken and couldn’t really work outside of it’s default for some reason, it also rendered the page i’m trying to use really weirdly, like it wasn’t sending some file over and the css got borked.
Found one that wasn’t foss, installed it, opened it, “buy premium to unlock this feature”, uninstalled it.
I’ve been using FX File Browser for the occasional need to share stuff localy - it opens a local web server where you can browse files on the phone.
Though it’s not foss and I am afraid that functionality is behind the plus version.