Readyshare files wrong format

> I am having an issue with my readyshare on my D6200.

   And you chose this "Cable Modems & Routers" forum instead of an
appropriate "DSL Modems & Routers" forum for this?

      https://community.netgear.com/t5/x/bd-p/home-dsl-modems-routers

> Some mp4 movies i copy to my harddrive does not show in videos on the
> readyshare. But instead is found in music folder as m'4a format. [...]

   "copy" how, exactly?

   ReadySHARE may be garbage, but I doubt that it's capable of
converting video formats (to audio-only) on its own, and then storing
them in some location of its own choosing.  For only "Some mp4 movies".
I suspect that your problem (whatever it might be) lies elsewhere.

> [...] Different usb drives/thumbdrives in different file systems.

   "different file systems"?

   What happens if you do whatever you're doing, but specifying a
locally-connected (USB?) destination, instead of a remote ReadySHARE
destination?  Blame assignment is job one.  Is the problem with
ReadySHARE, or with what you're doing with it?

   When I tried to post this, I got a (nonsensical) complaint:

      The message body contains M-4-A, which is not permitted in this
      community. Please remove this content before sending your post.

Where I've added the hyphens in "M-4-A".  I'll assume that that explains

the spurious apostrophe in your "m'4a".