This video shows the Echelon EX4s Assembly instructions. SEE CHAPTER TIMESTAMPS. If you're looking for the Echelon ex5s assembly instructions, or if you want to know how to build the echelon ex3 or any other echelon bike with the flywheel in the rear this video may help you.
timestamps:
0:00 intro
0:58 components analysis
3:05 ASSEMBLY


Echelon Connect Sport assembly: https://youtu.be/poGiyZAhwuQ
Echelon ex-15 assembly is the same as previous link.

The echelon ex5s assembly instructions are almost identical, the echelon connect ex5s just has a bigger screen for the most part.
I have plenty more videos on echelon bikes, I also made an echelon connect sport assembly video, which is the same build process for the echelon ex-15 on amazon (this was called the echelon prime bike at one time)