Lambus supports full offline mode (incl. all places, POIs, expenses, transportation, photos, documents, notes, etc.) with Lambus PRO. Once upgraded, you can tap on the "download button" at the top right of your trip cover photo and it will sync it automatically.
In case you are running into issues where some data is not available although you activated the offline sync, feel free to contact us via the live chat at any time! :)