Movies won't open

The files must be Apple-compatible if you’re using the native app.

Basically:

* h.264 video and AAC audio in an MOV, MP4 or M4V container

* M-JPEG video and PCM audio in an AVI container

loz134uk wrote:

have changed them to mp4. m4v and nothing at all. 

How did you change them?

By the way, the MPW device is just storage – it’s not having any problems storing / serving your videos.   But your videos must be playable by the device you are using to access it.

Other apps support more video formats.