It doesn't, because it can't.
The process of editing an attachment is: download a copy, edit it locally, upload the new version. The server cannot know what is being done to a copy of the file it holds.
There are some add-ons which put a form of lock on attachments so that people can tell someone else is editing and has the intention of uploading a new copy, but there's no way to know what is happening on other machines.
using Confluence since 2016 I must say Companion App is way worse then the former Office Connector. Selling Confluence as collaboration tool and not handling multiple editing office files is kind of shizophrenic. The office connector could lock the opened file. I would really appreceate, if you could consider a feature to adress this issue with one of the next releases.
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