No-code automation works best when the visual system is already approved. The scenario only needs to discover fields, supply data, start a render and handle the result.
Discover before mapping
Load the template input contract so the workflow reflects the real creative fields instead of relying on a handwritten copy.
Upload binary files separately
Use an HTTP step for the scoped upload, then pass the completed project media ID into the render request.
Wait outside the render request
Use polling for a first workflow or a webhook for production. Send the finished file to publishing, storage or review only after success.