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Check out the [latest version] of the documentation
Whether it's an image – like a mockup of the new marketing campaign that needs feedback – a PDF, a presentation, or any other file you can display in Confluence, you can drop a pin anywhere on the preview and add your comment to start a conversation.
To comment on a file:
Pinned comments work just like inline comments on pages. You can use @mentions, links, and macros, and drop as many pins as you need on any part of the file. Anyone with permission to add comments to the page can add and reply to comments on a file.
When you preview a file, you'll see pins for any existing comments. Select a pin to view the comment.
Once the conversation is finished, you can resolve the comment to hide it (and any replies) from view. If you need to see resolved comments again, you can reopen them. Go to > Resolved comments in the preview.
You can't comment on or upload a new version of files that are hosted on a web server and added to Confluence using their URL.
Need to go beyond commenting on files? You can even edit some files right from the Confluence page. See Editing Office Files to find out about supported file types and applications.