How to manage several regions?

Hello,

I’m sorry to ask but I couldn’t find the information.

I would like to manage France on an Android phone offline.
The problem is that I need too much ram.
I have cut the France in several pieces but how to know which file to launch?

And how to manage the routing if it’s between 2 files?

Thank you in advance for your help, I know that the offline is no longer maintained but it works very well for small areas, it’s just a problem of ram that I can not solve.

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