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Yourphone alternatives?
(slrpnk.net)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Yes, you do need both devices to be on the same network. USB tethering does just that (your pc connects to your phones internet connection).
I just get this on android.
On the desktop client, it also shows no devices
you could try the hamburger menu in the top right to add your pc with an (network) IP. If you're tethered and that doesn't work I'm out of ideas.