[FR] Exchange between platforms

### Description

Dear AppFlowy-Team,
I really like working with AppFlowy locally on my devices. One feature that I miss when working on different devices is the opportunity to import my back-up files from the desktop app in my mobile app e.g. on my iPhone or iPad. Are there any plans on integrating this feature to the mobile app ?

### Impact

Everyone who wants to work locally without hosting an own server.

### Additional Context

_No response_