Since 2021.02 there are 2 options to upload tasks. Upload multiple tasks or Upload one task. This can be chosen from the scheduled tasks page.
Upload Multiple Tasks
Same as the prevous "Upload Tasks" functionality. A tasks.xml file is expected.
Upload One Task
A tasks.xml file is expected with exactly one task definition. If a scheduled task was found for the same workflow id, the existing task will be marked as finished and the uploaded task will be added as a new task. If no matching workflow id is found, the uploaded task will be added as a new task.