I finished Whole process of SPPID installation. and it works well. but after I shared my remote computer with my co-workers, I found they can not open the drawings.
After asked the master, I know there is one more step need to do: right click your Site Server. then click the permissions. add your co-worker's name on it. then refresh the role in Engineering Manager. It work!
The logic is clear: your co-worker need permission to access the reference files. Otherwise, they only can connect with server but doing nothing.