Hi Doug,
By design, RadFileExplorer's FileSystemContentProvider has an internal permission check method which requires UploadPaths / DeletePaths to be set in order to allow executions of a corresponding command. Please, try setting these properties to see if the problem still exists. If this does not solve the problem could you please open a support ticket and provide the custom content provider so we can investigate it further?
Regards,
Dobromir
the Telerik team
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