The Smart Vid flow can be changed at any moment:
Open the Step Settings for the main video step or any video step in your flow, and modify its settings inside the Question menu (remember that questions are the ones who control the flow and expand it in the canvas)
Pick a different video step in order to change the flow based on your needs (see gif below)
Now the flow will be changed and will lead viewers to the new step after you publish your changes 🚀