What do the points on the flight plan lines mean?
The points on the perimeter of the polygon shape when planning are the adjustable vertices to change the shape. You can also click on the midpoint of each line to create new vertices.
When uploading the blue dots are the locations of the images, but you can also use the white dots to modify the shape of what you want to be processed.
I believe the green points on the plan are the changes in elevation from using terrain awareness.