We tried to reproduce this behavior locally but without success. We performed some tests using Safari, IE and Chrome browsers for iPad and simulators in desktop browsers but none of those test replicate the problematic behavior.
Based on the screen shots you attached, the issue might be caused by the styles applied to the container element. Look for the styles such as height: 100%
or overflow: hidden
and test disabling them in order to see if it will show the Preview button. The viewer's container has absolute position by default and certain styles of the parent containers can hide some of the viewer's content.
Additionally, check if the browser uses some zoom level and test resetting it.
In case the issue persists you can send us a sample that reproduces the problem in a support ticket
for further investigation.
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