Menion I can confirm the preview image loading in data manager works with v3 lomaps.
BTW. Lomaps download can be a disaster when maps reside on external sd. Because you let it download the zipfile there. And extraction from ext sd to ext sd is often too much for Android. Resulting in a totally bricked device, you even have problems to reboot. After minutes of problems, it will not work and I manually do the job: copy zip file to internal sd. Extract to internal sd. Copy to external sd.
IDK, I bought a quick SD but Android seems to have limitations here. Some other dev. (Moon+ reader) told me that once.
Maybe consider offering to define a different temp file location.
BTW. Lomaps download can be a disaster when maps reside on external sd. Because you let it download the zipfile there. And extraction from ext sd to ext sd is often too much for Android. Resulting in a totally bricked device, you even have problems to reboot. After minutes of problems, it will not work and I manually do the job: copy zip file to internal sd. Extract to internal sd. Copy to external sd.
IDK, I bought a quick SD but Android seems to have limitations here. Some other dev. (Moon+ reader) told me that once.
Maybe consider offering to define a different temp file location.