Custom commands with attachments

Hi !
Is it possible to get attachment files posted in custom slash commands ?

Hi @gloupmer,

Wondering if this section of our docs might help:

that’s about the command response but what I meant was about receiving the files posted

With the outgoing webhooks there is a field ‘file_ids’ that corresponds to the attachments ids.
But this field is not in custom slash commands.

Is there something to activate to be able to have this field ?