I've played around with many self-hosted file manager apps. My first one was Ajaxplorer which then became Pydio. I really liked Pydio but didn't stick with it because it was too slow. I briefly played with Nextcloud but didn't stick with it either.
Eventually I ran into FileRun and loved it, even though it wasn't completely open source. FileRun is fast, worked on both desktop and mobile via browser nicely, and I never had an issue with it. It was free for personal use a few years ago, and unfortunately is not anymore. But it's worth the license if you have the money for it.
I tried setting up SeaFile but I had issues getting it working via a reverse proxy and gave up on it.
I like copyparty (https://github.com/9001/copyparty) - really dead simple to use and quick like FIleRun - but the web interface is not geared towards casual users. I also miss Filerun's "Request a file" feature which worked very nicely if you just wanted someone to upload a file to you and then be done.
> I also miss Filerun's "Request a file" feature which worked very nicely if you just wanted someone to upload a file to you and then be done.
With the disclaimer that I've never used Filerun, I think this can be replicated with copyparty by means of the "shares" feature (--shr). That way, you can create a temporary link for other people to upload to, without granting access to browse or download existing files. It works like this: https://a.ocv.me/pub/demo/#gf-bb96d8ba&t=13:44
Copyparty can't (and doesn't want to) replace Nextcloud for many use cases because it supports one-way sync only. The readme is pretty clear about that. I'm toying with the idea of combining it with Syncthing (for all those devices where I don't want to do a full sync), does anybody have experience with that? I've seen some posts that it can lead to extreme CPU usage when combined with other tools that read/write/index the same folders, but nothing specifically about Syncthing.
On the topic of self-hosted file manager apps, I've really liked "filebrowser". Pair it with Syncthing or another sync daemon and you've got a minimal self-hosted Dropbox clone.
* https://github.com/filebrowser/filebrowser
* https://github.com/hurlenko/filebrowser-docker