The KMZ importation onto the RC 2 is not an easy activity and it assumes you are knowledgable on the topics of file management on an Android mobile device like that. The videos we provide are intended as a "it generally goes like this" kind of guidance. It sounds like the exporting of the KMZ from Map Pilot Pro is working fine.
We don't provide a written step by step because there are lots of different ways to do it using softwares that we don't necessarily endorse.
The most important steps are that you create a dummy mission using the DJI app to make sure that the file structures are created. Then you browse using some file utility to find the created dummy file and replace it with what Map Pilot Pro creates. This is all just kind of a hack in general, but with the RC2 there are even more steps. It is not easy. Don't feel bad if you are struggling. That is not our intent but it is the only way to get it to work.