The documentation for the newly released Concrete5 version 5.7 may not be complete yet. I haven't found in the documentation a way to dynamically add the file selector wherever I want and how many times I want on a page, but I figured it out, so here it is:
I hope that this was helpful :)
type:1 at the end is for images.
Other values for the file types can be found in the Type class from the Concrete\Core\File\Type namespace as follows: