Never mind, I had to add a supported file format with only the file extensions selected.

But I don't have any incompatible video rules set

Don't use Incompatible for your Auto-Conversion rules as that relies on the Supported Formats settings.

How do I go about adding h265 as a "supported format" so I can sync videos to my android phone and tablet.
I don't care if Media Monkey can't play it as I have other software on my phone that can.

I'm running v4.1.24.1883