Workspace
Post settings
Per-channel image counts and post layout. Workspace overrides take precedence over platform defaults; platform admins can edit the platform row to set new defaults for everyone.
Per-channel settings
An override saves a workspace-specific row; clear it to fall back to the platform default. Layout controls how compose suggests laying out the post — no enforcement yet, just a hint to authors and the AI.
Platform defaults
These apply to every workspace that hasn't set its own override. Adjusting
max_images here changes the hard cap shown in compose; recommended is the suggestion shown to authors.