I guess I was not clear enough.
I have a download that I will update (marked in red)

In the editing screen I select the new file, see that I use a file with a different name to make sure it has been changed (adm006_04.pdf) and after saving.

When I return to the home screen the tag "UPDATED" does not appear even though I know I updated the file.

And in the "Read More" link the "Changed" field is empty.
This field is always empty even though I know I've updated the file.

Within the jDownloads going to "Layouts" alternative "Download Details" is selected the Layout "Standard Details Layout v3.2 - Full Info"
Inside it can be seen that the tag used in the "Changed" field is "{modified_date_value}".

And going to "Layouts: Files" I activated the Layout "Alternate Files Layout v3.2" where it has
the "{pic_is_updated}" tag that indicates that it should display when the file is updated, even though I choose any other layout the effect is the same, that is, it does not appear.

I would like to know how to solve this, since I have not made any modifications in jDownloads and notice this behavior even in fresh installation.