Steps to Reproduce

https://zkfiddle.org/sample/1ils06n/2-Upload-menuitem-bug

Current Result

part of the first button is overlayed by a hidden (opacity: 0) part of the actual file upload <input> element

Expected Result

other widgets should not be obstructed

ideally reconsider this 'hack' (retest on supported browsers) to see whether it's still needed.

Debug Information

Workaround

        span.z-upload {
            position: absolute;
            top: 0px!important;
            left: 0px!important;
        }

 // in IE > 10 and other modern browser
 span.z-upload input {
        pointer-events: none;
 }