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The upstream FLUX Action repository and DROID model card provide model and evaluation references. Upstream local inference code does not directly connect a simulator to the Reactor endpoint. This guide does not supply a turnkey Reactor simulator adapter for FLUX 3 Action. Use first actions to check transport, then implement the bridge against the wire contract. Run the action samples at 15 Hz using a controller that accepts absolute arm joint targets. Choose and evaluate an execution horizon before querying again; a shorter horizon requires a fresh measured observation. Account for inference delay explicitly in either simulated time or wall-clock time and record which you used. A successful synthetic reply does not establish simulator task success. Record episode success, observation age, controller errors, and action limits before moving to hardware integration.