This is still not possible, even in the new DJI Go App for Android. Every time I see a message "Synchronization failed".

Have someone a hint for me?

I had/have issue.

First, make sure you are on Wifi... and not phone data.

If still happens, it is because partial data of one of flights is lost.

I just cleared all the flight data and synced from cloud.

Many flights lost but so far no more issues.

I tried DJI support to help but no luck.

The new update to 2.0.1 has solved this problem. I can now even synchronize flights longer than 15mins.