Debian
Installing libayatana-appindicator3-1
Section titled “Installing libayatana-appindicator3-1”This library is dependency of drop-app. Without it, drop-app will crash on start up.
sudo apt install libayatana-appindicator3-1Installing drop-app
Section titled “Installing drop-app”To install drop-app on Debian, simply download the amd64.deb or arm64.deb package from this page and open the downloaded file.
It will open it in the Software app. You can click Install on this page.

You can also choose to install it via apt:
sudo apt install ./<downloaded .deb image>Uninstalling drop-app
Section titled “Uninstalling drop-app”You can uninstall libayatana-appindicator3-1 if no other applications depend on it,
or if you simply want to get rid of it, you can do so with the following:
sudo apt remove libayatana-appindicator3-1You can then uninstall drop with the following command:
sudo apt remove drop-desktop-client