There is a way to edit the Attachment class that is typical of Atlassian.That is, to this class https://docs.atlassian.com/atlassian-confluence/5.8.6/com/atlassian/confluence/pages/Attachment.html add a new field and they're respective get and set.
@Marcelo Montaño Sánchez Technically you could but I would recommend against it. It would be something you would have to maintain on every upgrade and would nullify support. I would suggest building an app or finding one that provides the solution you are looking for. What specifically is the business need?
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