Dropbox on Linux

Good news: Dropbox runs on Linux. It's the same app you use on Windows, and TuxPick installs it for you from Flathub.

Dropbox

Also on Windows

Dropbox's own app for syncing your files.

Installs from Flathub.

Press the install button above. TuxPick opens with the app already ticked. Add anything else you need.
Download the installer file.
Open a terminal with Ctrl Alt T, run the one line TuxPick shows you, and type your password when asked.

It works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.