Yes,
I have used Dropbox for syncing my files for a long time, but some users have experienced problems since my last update. This is caused by changes to how Android deals with file storage in later versions, and is something I'm working on for the next update.
With some of the online storage options going towards a subscription model and the risk of them being hacked, I have started relying more on Syncthing for synchronization between the desktop and the phone. I have set up a folder that will sync directly without the use of external cloud storage. Syncthing can be a little tricky to set up, but once up and running, it works very well for syncing the todolists between various devices.
Please let me know if you have problems with the synchronization!
Heidi