Document Understanding vs AI Center?

Document Understanding is confusing me at the moment.

Is the module “Document Understanding” in our Cloud environment ment to replace AI Center?
In the documentation is says that models are retrained automatically by using data from Validation Station (Action Center):

Does this mean we can just use “Document Understanding” and don’t worry about the taxonomy file etc., sisnce everything is set in DU → Build ?

In my project flow where I Classify and Extract from invoices, I want to sent those with low confidence to the Action Center (unnattented flow).
When people have manually done the tasks in Action Center, how do I get that data later?
The output from the manual task is in a storage bucket, but there’s no easy way to get the data and use it further.

@Ferdinand,

I would suggest to get the understanding of all the basics from this Academy course. This course will answer all the questions.