Micro SD to use with Kodi P2P downloads

Hello

My previous TV box was android 4.4 and the Micro SD can only be used as external memory

Now with Zidoo and Android 6, I see there are two option(internal added to the Zidoo memory) and external

Wich option is better for Kodi and Quasar download path?

Can I write on the microsd when used as a external memory?

 

Uses plugin elementum.
No external memory.
Only RAM!

 

CAn you help with the Elementum settings, it is a new Addon and there is not much information about it