WorkFlow on NextCloud 10

I do not understand how the module “workfows” works.
I find no documentation.

On the website it says it can, for example, change file formats. But there is no help.


It can be used to write apps, which then do the file conversion.
One example of a workflow app is the Files Access Control app:


Then I don’t understand the dialog and the rules creation into de
Have you some documentation ?

Tanks an advance

Regards, Cayetano