I'd disagree with that statement if using a recent 2.4x DNAS and there's some extra changes in the coming 2.x DNAS release which should resolve it not working in the remaining cases (which is primarily due to the players not being tolerant to how intro files have to work).
without a working link to the DNAS to check (and know what version is actually being used), all I can suggest is looking in the DNAS's log for any indication of errors or intro files being skipped due to mis-match of details, etc.