I have a fairly simple setup in Blender 2.81a.
A model, light source, camera, and a simple plane beneath it. I am attempting to render an image which renders the plane as a transparent background, but also has the shadow of the model cast onto it. In prior versions of blender this was do-able simply by allowing shadow casting onto the object and then making the object transparent, but this seems insufficient now that I have updated.
I have tried Eevee, and Cycles, but neither worked the way I'd like.
Currently I am messing around with a Mix shader comprised of a Transparent BSDF and a Diffuse, but while setting the Fac to 0.1 gets a "close" result, it still brightens the background slightly (since my diffuse color is white), which ruins the effect that I'm going for.
Any help would be appreciated. I am still very much a beginner with Blender.