Because edge metal is almost always shorter than your roof eaves and rakes, you pretty much always need more than one piece per run. This means overlapping two pieces of flashing.
And that means a potentially ugly hump in the drip edge.
Remodeler Ben Bogie has a solution to reduce the humpiness of overlapped edge flashing: cut the folded parts off of the drip edge for the same depth as the overlap. For example, if the overlap is 2 inches, cut two inches of folded protrusion off the overlapping piece.
The edge metal in the video has a hem along the top, so Ben Bogie cuts that off, too. He also rounds the top corner so that when he slides the pieces together, they will slide together smoothly.
When choosing an overlapping strategy, think about the focal point. If the overlapped pieces are closer to the viewer, then the joint will be far less visible. But that rule only applies to the eaves. On the rakes, you must overlap the upper pieces over the lower to push rainwater out of the roof system.