Thanks for the reply Eric.
I’ll take a look at Nick’s plugin. But, let’s say I decide to just create smaller versions of the logo for phone/tablet viewing. After creating different versions and uploading them to the media library, how/where would I point to those smaller logos? It seems like using the “Custom Header” page to upload and select an image will only serve as the primary image. How then do I point to smaller images so they load for mobile viewers?