Problem Definition

In the past, it was possible to use the Companion app, which got deprecated, in order to edit files directly on Confluence pages.

As highlighted on the Differences administering Confluence Data Center and Cloud:

In Confluence Data Center and Server, users could edit an attached file in any compatible application using the Companion app. This is not available in Confluence Cloud. To edit an attached file, you need to download the file, edit it in a compatible application, then manually re-upload it to the page. 

Suggested Solution

Deliver a native functionality for Confluence Cloud that will allow for direct edition of attached files.