RadAsyncUpload does not have permission to write files in the TemporaryFolder

[Elito]

Hi Team,

We developed multiple file upload feature using RadAsyncUpload control with telerik version 2012.1.411.35 on our SharePoint platform.
Our environment have 4 web front end servers; hence we use network-shared-folder for Target and Temp folder of RadAsyncUpload  control.
This network-shared-folder was granted "full access" on Network Systems, Authenticated Users and Every One user accounts. But we are unable to succeed using RadAsyncUpload control.

So,
Can you tell us what permission / which user to be granted permission on this network-shared-folder?
Is it possible to use local-folder on all 4 WFE platform? Wouldn't we have issues during upload in this case?


FYI, the error we receive while using network-shared-folder is below,

System.Exception: RadAsyncUpload does not have permission to write files in the TemporaryFolder. In Medium Trust scenarios, the TemporaryFolder should be a subfolder of the Application Path.    at Telerik.Web.UI.RadAsyncUpload.TestTemporaryFolderPermissions()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Control.PreRenderRecursiveInternal()     at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyn... 2089f4ca-c105-4340-ab32-ac3565390869

Thanks in Advance,