I am currently working on customizing the mobile app with small style changes via CSS. All of my color changes work fine, but when I attempt to add a background image to a class, the image does not show. The classes I worked with were .bar-content and .bar-side-menu.
I used the slideshow at https://www.slideshare.net/DaniPalouSala/creating-moodle-mobile-remote-themes-moodle-moot-us-2016, specifically page 12, to double check my CSS, even going so far as to copy it exactly (changing the image URL, of course). If I add my image as content instead of background like on page 13, it shows. That tells me my image path is correct, at least.
I only have iDevices and my desktop environment on which to test. Background images work on the desktop environment only after adding !important. I have read that certain mobile devices have an image size/dimension limit, but my image is fairly small.
Is there something I'm possibly overlooking?