backgroud:url not working on mobile end

I see a strange issue when I use layout grid. I add an image to atlas_ui_resources package in my project, and use this image as a background image for layout grid. When I run the project, the first one is on phone browser, the second one is on the mendix mobile app. And the second one cannot see the background image. So wired. I don’t know how to debug this, can someone help with this? TIA
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