SYMPTOM:
When users follow the technical note KB42338: How to Add a Custom Coordinates File for the Image Layout Widget in MicroStrategy Web SDK 9.3.x-10.x, it works in Strategy Web Visual Insight as expected. The map appears, like in the following example:

However, on Strategy Mobile 9.4.1 App "Background image not found" message appears, as shown below:

CAUSE:
This is a known issue in Strategy Mobile 9.4.1.
ACTION:
This issue is fixed in Strategy Mobile 10 iOS application. Upgrade to this release to take advantage of the fix.