Confluence needs real-time collaboration on attachments just like as if they were on Dropbox or SharePoint. Users get real time feedback on other users changes and merges them to a new version. Also users are warned that other users are editing the same file.

Same here! This feature is a must-have, please please add this!

Concurrent editing is not needed; we just need users to know when someone else has opened a document (Excel) but hasn't saved it back to the page.

We have same kind of issue in my company (7500 active licences)
This feature is a must-have.

We really need this as we have multiple users that update complicated rosters in Excel that are attached to the page. Probably another issue but we are getting an error when using the Office Connector to do with Basic Authentication and SSL. Yet to work that one out but having warnings when editing the same attachment would be great.

Two people or more can today edit a confluence page and save it and both their work will be saved without any losses or conflicts. Can´t you come up with a solution for it with attachments and macros ?
Thanks.

@Mark absolutely - I vote for both concurrent edit abilities AND also ability to show if someone already has the attachment open.

The latter would be my preference to happen first since it's most detrimental to our workflow.

@ Alice - concurrent edit would be a nice to have....

I have the same comment as @John Price. We don't need the ability to concurrently edit, just a warning or pop-up (as would normally appear if opening the document on a desktop) that says someone else has it open.

We would like this as well. This would prevent to users from overwriting each other's word/excel documents.

We need this as well. Concurrent editing is not needed; we just need users to know when someone else has opened a document (Excel) but hasn't saved it back to the page.