Last update is 25 November 2021 but the Remarkable team has just released the 3.0 version, with new features as a major update. Hence, previous versions of app do not communicate with the server, and files are no longer synchronized.
Thanks a lot @sergiusens ! The app works fine, it doesn’t matter if it crashes sometimes, as long as I am able to open it and check my files from my desktop. You’re the best!