How do I change the thumbnail for folders with more than 1 video in them?

[fighuass 1]

I have a couple of folders, some of them contain 1 video and have a thumbnail, and some contain more than 1 video and are simply colored blocks. Is there a way to change this, and automatically let Emby do this?

[Luke 38493]

This should be improved for the next release of emby server, thanks.