Higgsfield free unlimited trial allows only one active job

When generating video through Higgsfield's free-trial unlimited allowance (e.g. via the ChatGPT Higgsfield plugin), the account accepts only one queued-or-rendering job at a time. A second submission from any chat returns 429 rate_limit_reached and creates no job (confirm in Higgsfield's read-only generation history), so opening several chats does not parallelize. Plan batches as a strict sequence: submit the next clip only after the previous job is terminal, and record each job ID right away so a closed session can resume by job ID without resubmitting. A Seedance 2.0 720p clip took ~20 min wall time, mostly queue.