How to install litchi on another Android device and still be linked to the same mission hub

The manual says that the software can be installed in different devices of that same platform but did not worked for me. I can’t get my missions in my new installation in my Android tablet. Please help.

Just copy them manually.

Synchronizing missions only works between devices that use the same Litchi account.
And you have to be logged in on all devices (in the Litchi App).