So I use the nemo file browser. I also started using Tailscale recently. I liked the idea of using Taildrop but I wanted a way to not have to use the command line every time. (I don't mind the command line but sometimes, especially for books, I use the file browser). So in ~/.local/share/nemo/actions/taildrop.nemo_action I added the following:
[Nemo Action]
Name=Send to iPad
Comment=Send file %F to iPad
Exec=sh -c "tailscale file cp %F ipad:"
Icon-Name=edit-copy
Selection=notnone
Extensions=nodirs
Separator=,
Dependencies=tailscale
Note, you'll want to change ipad to whatever device you want to send files to. But now, I can right click on a file and click Send to iPad and off it goes! You also might need to do sudo tailscale set --operator=$USER first to be able to run as your user. But if you can run tailscale file cp ... in your terminal (without sudo) it should work.
Of course, it doesn't have to be an iPad, that's just what I have. You can make one for any device you want to send files to.