Follow-up from "Use the same parameters names to save & update the actions"

The following discussion from !267 (merged) should be addressed:

• @nils.brinckmann started a discussion: (+1 comment)

  While I wanted to test if we can associate attachments with the actions, I realized that it is not possible to upload files currently:

  vuex.esm.js?2f62:1134 [vuex] module namespace not found in mapActions(): files/