I am using Safari (5.1.7) version and multifile selection is not working in Safari. It works fine in other browsers (IE, Chrome, Firefox).
The documentation says multifile is supported in Safari as well. Can the team confirm this?
Under Safari RadAsyncUpload control is using FileAPI module to update files. Safari browser does not implement the interface correctly and that causes issues with multiple selection. Please try the following code snippet which works fine at my end.
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