Thanks Kyle!, While I was reading your message I checked that my org-mode
version was outdated. I configured org-mode repository, but I didn't
install the latest org-mode version. So I'm sorry for that. I've tried your
snippet, and it works perfectly. Thank you for you time, I appreciate it.

On Sun, Jan 3, 2021 at 9:46 PM Kyle Meyer <kyle@kyleam.com> wrote:

> Pablo Palazon writes:
>
> > Hi everyone!
> >
> > I've had a trouble with attachment type link on exporting. I configured
> > org-attach directory and using org-id and it works great on emacs, all
> > those links work great. I can see any attach linked on org notes, but in
> > exported files all those links point to local directory instead of the
> > right attached folder.
> >
> [...]
> > I tried to use
> >
> > (add-hook 'org-export-before-parsing-hook 'org-attach-expand-links)
> >
> > And it works except for inline images, but I don't understand why is not
> on
> > org-mode repository code.
>
> Hmm, I'm not sure what you mean by the last part.  The snippet you show
> is in the Org repo, specifically in org-attach.el:
>
>
> https://code.orgmode.org/bzg/org-mode/src/release_9.4.4/lisp/org-attach.el#L750
>
> I'm not an org-attach user, so I might be missing something obvious, but
> I wasn't able to trigger the issue with inline links.  Here's what I
> tried using the default configuration on the master branch (c3888a8b7):
>
>   (require 'org-attach)
>   (let ((default-directory (make-temp-file "org-attach-export-test-" t)))
>     (with-current-buffer (find-file-noselect "scratch.org")
>       (insert "* h1\n\n")
>       (org-attach-url
>        "
> https://orgmode.org/worg/images/agenda/org-agenda-colorized-blocks.png")
>       (insert "attachment:org-agenda-colorized-blocks.png")
>       (org-open-file (org-html-export-to-html))))
>
> That output includes
>
>     <img
>
> src="file:///tmp/org-attach-export-test-Surcu0/data/ad/4bdf8f-a28e-4621-a1e4-dc772ed6d531/org-agenda-colorized-blocks.png"
>     alt="org-agenda-colorized-blocks.png" />
>
> and the image is rendered inline.
>
> Could you provide a minimal reproducer for the issue you see?
>