the app for Android doesn't keep the images inside the maps

When I create the map, I con add to it all images I want but when I close and reopen the map many images don't appear anymore and they are replaced by box with the cross
I'm using Android 4.1 on Trekstore tablet 10.1.
Please deliver a patch to solve this issue, the image feature si very usefull.
Many thanks, ciao, MG