Hosting file access?

Hi I'm currently evaluating Hosting and my membership after reading the recent announcement to no longer actively develop many of your premium plugins.. as I'm a seasoned web developer and after testing out Hosting, can you please answer some of the questions below

1. is it possible to access and edit my files at file manager level?

2. how do i setup multisite in Hosting?

3. if something goes wrong with my multisite setup, does your support help to look into the problem?

thanks,

Ivan