@André-Faria To sync POIs you need to use SuuntoLink, the PC program. In addition the app.
https://www.suunto.com/Support/faq-articles/transition/how-do-i-sync-routes-and-pois-to-the-watch-for-ambit-123-and-traverse/
When it comes to altitude, try to add a view to the display of the sport mode you are using. Altitude is built in by default. Additional views are called Suunto app as well (not to be confused with the app on a mobile device), I found and tested different compass/coordinate apps. Probably also some additional ones to find for altitude. To me the built in altitude view is working good. Check if altitude is working when teh activity is started, maybe the configuration in the watch should be adjusted.