...
Map name: internal name
Map thumbnail: miniature image that is used for navigation between different maps
Tip: Optimal resolution: 94px x 94pxGeneral map info: can be set per language
Map: background image, the map itself. This can also be set per language. If it is the same for every language, activate ‘apply to all languages’ after you have uploaded your photo or video and before saving.
image: .jpg or .png
video: .mp4. The video is playing in loop with audio.
...