When you are building the LEGO Technic 42100 Liebherr R 9800 set the app has a verification process built in after every batch of bags. This is a great addition because you can see whether the motors built in are working correctly or not.
Unfortunately there’s a bug in the current version as of 05/10/2019 (version 1.0.2 on both Android and iOS ), after the second batch of bags at page 367 you should only have one XL motor (color code red) connected to the hub in the superstructure.
UPDATE #4 – Here is my full review with unboxing, build details, feature presentation and an outdoor field test in a quarry!
UPDATE #3 – According to zusammengebaut.com LEGO Germany confirmed that the release of the set will be delayed until October 2019 because of some production problems of certain parts. This delay does not affect the other Technic sets scheduled for August.
UPDATE #2 – Check out my detailed summary about the Powered Up system and the currently available components that will power this set as well
UPDATE – We received a some detailed images of this gigantic construction set from the Bauma 2019 convention that happened last week (image source – Promobricks)