Hi d6Hemant,

The uploader support 4 upload types. HTML5, Silverlight, Flash, IFrame. it  it depends on your browser, if your browser support html5 and has silverlight/flash plug-in installed, then it will support all upload types. if the browser does not support html5,silverlight,flash, then the uploader will use the iframe mode automatically. The browser will switch the upload mode automatically if the browser does not support the upload type you set for, so it will not causes problem. By the way, the multiple files select function only support to use with html5,silverlight and flash upload mode.

Regards,

Ken