Still seems to be present on my phone. I love that little app. It's so dang useful to be able to wirelessly copy files from my pc to my phone and vice versa. I previously tried a sftp client on android (terminus?) to no avail. Edit: I installed via the play store, I see many folks have installed it via fdroid but I'm not sure why.
Little known feature of tailscale, it let's you send files to all your devices. Has to be explicitly enabled on certain platforms and you'd never know it existed without reading the docs.
It's called Taildrop. https://tailscale.com/kb/1106/taildrop/