Problem
When you preview your design directly from Adobe InDesign or when previewing a .article or .publication file from the Mac App sometimes results in missing content.
Cause
The problem is most of the time caused by network related errors or timeouts.
Solution
To check if this is indeed the problem, you can use the built-in sharing functionality in Twixl Publisher to send your preview to your device. This will avoid the WiFi network problems and should result in a correct result.