Casting full device lossless audio to UPnP

[simoncn]

MinimServer doesn't support casting. It can play files from a local device (computer or NAS) or network streams. For these sources, it supports transcoding to enable you to solve most format incompatibilities.

I suggest you investigate what is causing the "incompatible format" error when casting using BubbleUPnP. You might be able to resolve this by enabling BubbleUPnP transcoding.