A flow starting point is where a prototype begins. Establish a flow starting point on the first top-level frame in your flow.
How to add a flow starting point
Select first top-level frame from the canvas or layer panel on the left.
Click the prototype button at the top of right sidebar to open prototype panel.
Click the "+" sign in the flow starting point section & choose a name.
Confirm a flow starting point has been added
Click the prototype button at the top of right sidebar to open prototype panel.
If you've properly set a flow starting point, you will see a blue rectangle appear on the top left hand side of the first top-level frame in your flow.
Other considerations
If there are no flow starting points in your design when you open the plugin, you'll see a warning notifying you one is missing, and you won't be able to export your design.
