I see that you use an Upload path which is not child (or the same as the ViewPaths) of the path(s) set to the ViewPaths property. Please note that, however, by default this scenario is not supported and you need to do some extra work in order to achieve the desired result. You need to implement a custom FileBrowserContentProvider
and, at least, override its CheckUploadPermission and StoreFile methods in order to achieve the desired result.
The better solution in your case is to set the upload paths to be the same as ViewPaths. Subclass the default provider (Telerik.Web.UI.Widgets.FileSystemContentProvider) and override its StoreFile method in order to save the file to another location than the one shown in the FileExplorer control.
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