Select one of Event Gather actions in the sidebar (0, 1, 2, 3 each represents a concurrent runner). For example, this instruction will use Event Gather 0.
In the Run Workflow dropdown, enter a "From" and "To" dates to create a timerange for the job run. Due to the number of videos per day, I recommend no more than 24h for each backfill job. The format for the time is strict. For example, to backfill a single day: May 03, 2023, the input should be from (the first input): 2023-05-03T00:00:00 and to (the second input): 2023-05-04T00:00:00.
Select "Run Workflow" button in the drop down to trigger the run.
After starting the job, the list of actions will display a Queued job that should transition to In Progress soon. After the transition to In Progress, you can select the job run attempt itself to track progress.
Using 2023 Session Calendar https://leg.mt.gov/content/committees/administration/legislative-council/2021-22/2023-Session-Calendar.pdf