Two axes: asset type (text, image, short video, …) × network. The pair must match what that network allows.
Networks = whatever Buffer exposes for your workspace (X, LinkedIn, Instagram, etc.). Not in Buffer → not in Prometheus yet.
The matrix turns combinations on/off and sets cadence; defaults come from channel setup.
One enabled row ≈ one contract: business + platform + content type + cadence → right asset, channel, time.