As per my knowledge, I know we can share files between two apps through App Groups
developed by the same developer account/certificate.
But here my question is : Can I do the same thing Sharing file between different apps through App Groups
with different apps developed by different developer accounts which handles by my own?
The answer is no.
If you create a provisioning profile with an app group my.app.group
and extract entitlements from it, you will see that the group is referenced as XXXXXXX.my.app.group
where XXXXXXX
is your developer ID, so on another account the group will be YYYYYYY.my.app.group
and it will be perceived as a different group by any device.
More info: App ID, Application Groups