Quick question: Sample image url structure of main site

Hello,
I am reviewing the changes I made to the database of the main site and got confused on this point.
(I am talking about a multisite installed in its own folder.)

The post urls of the main site are:

On the back-end:
domain.com/folder/post-permalink/
On the front-end:
domain.com/blog/post-permalink/

How does the images urls look like on both sides?

Thanks in advance.