Problem with untagged files

[Budgie]

Hi Simon,
Just posted this message on Linn DS forum but I think you will have the answer:-

Using minimserver on Qnap NAS to serve bbc radio tracks saved as .m4a files. Due to an error on my part a number of files were not tagged at the time they were downloaded. No problem I thought I can navigate using folder view. Using BubbleDS on Samsung SIII I can move the files into playlist but they do not play on any of my DS devices. (The files play fine if I just share them with NFS.) Any views as to where the problem lies? Is it the control point, minimserver or the DS which falls down with the untagged files?

I shall of course be tagging the files in due course but meanwhile would like to understand the cause of the problem and learn if there is a quick fix pending the tagging exercise.
Regards,
Budgie