Your roadmap may contain multiple submission steps (letters to generate and send), but only one is active at any time. This is deliberate.
The reason: each letter builds on the last. A counter response needs the institution's rejection to reference. A chaser needs the unanswered letter to cite. An escalation letter needs the full correspondence history. Sending multiple letters simultaneously would weaken each one because they can't reference each other.
When you complete a submission step, the next one activates automatically. Non-submission steps (uploading evidence, recording updates, confirming details) can be active alongside a submission step; they don't block each other.
