1. Open the following page on IE11
2. Click on the upload button
A file selection dialog should be displayed once the button is clicked. However, the dialog would only sometimes be displayed after several tries.
test.zul
<?page title="IE11 Upload Issue" contentType="text/html;charset=UTF-8"?> <?script content="zk.useStackup='auto'"?> <zk> <window title="Click to select a file to upload" border="normal" width="200px"> <button upload="true" label="Select a File" vflex="1"> <attribute name="onUpload"><![CDATA[ Object media = event.getMedia(); alert("file uploaded"); ]]></attribute> </button> </window> </zk>