Good afternoon, and thank you for raising this on Atlassian Community. We've discontinued the Companion App in Confluence Cloud, but you can edit documents inline using the Google Drive macro instead if you host them with Google.
I hope that helps!
Shannon | Atlassian Community Support
Hey @Piyush Annadate
I found this answer from an atlassian.
There is no alternative to the Companion App in Confluence Cloud, but it is an optional feature. Users can replace files by dragging and dropping into the page editor, the attachments page or attachments macro.
The app itself is compatible with both Server/DC and Cloud, no need to upgrade other than to ensure you are on the latest version.
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