That's just great. It's literally the only use case I had for it. There are tons of better ways to share files on PC.
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The truth is, the android app has existed for over 10 years now and it has never been good. It kinda mostly worked for some use cases, but always-on continuous sync on battery wasn't really one of them. And that's been true even before Google justifiably started restricting filesystem access in KitKat(!) 11 years ago.
If you are looking for an Android app that does syncing in the background well, I can highly recommend FolderSync.
The main reason I use Syncthing is not to use Dropbox for sensitive stuff, which I also use since it's on-demand mobile sync is way better.
FolderSync can do "on-demand" very well if you mean that you just want to tap a sync button to trigger it.