My Cloud Implementation - Success at Last - Tips for others

It’s a Windows thing; it won’t allow access to network drives using mixed credentials.

Unmap all network drives, and then re-map them, forcing it to use the MyCloud User credentials for all shares, including public shares.

For your Minix media box, I’d suggest installing Kodi, and connecting via SMB.

For DLNA, have a read of my Twonky FAQ