If you’ve ever added someone to a SharePoint library only to be told they “can’t see everything”, you’re not alone. On the surface, sharing documents in SharePoint seems simple—copy a link, paste it into an email or page, and move on. But behind the scenes, the way those links are created can quietly change permissions and lead to confusing, hard‑to‑diagnose access issues later.

In this post, we look at a common but often misunderstood sharing scenario in modern SharePoint libraries, why documents can seemingly disappear for new users, and what to check when library permissions don’t behave as expected.

Where are all the documents?

It’s not uncommon to add a document link to an email or on a SharePoint page.

This is fairly straightforward - go to the library, select the document, and click ‘Copy link’ in the menu.

Microsoft has documented the various options for links (shown below) but has not specifically outlined the potential hazards regarding permissions.

Copy link and missing documents

One of our clients had been using the copy link feature to share documents in a modern library.

After sharing many document links they decided to alter the permissions on the library. They gave the library unique permissions, added additional people to the library, but then found not all documents were visible to the newly added users.

Checking the permissions on the library found the warning, ‘Some items in this list may have unique permissions’. Clicking on ‘Show these items’ listed all the documents with unique permissions, which were all the documents that had been shared through ‘Copy link’.

We've experimented with all of the options in the ‘Copy link’ drop-down but they all create unique permissions.

There is no magic bullet here, but you can easily make a document re-inherit the library permissions to fix this issue.

So if someone can’t see all of the documents in a library, consider the sharing problem and check for unique permissions using ‘Library settings’ > ‘Permissions for this document library’.

Conclusion

At first glance, missing documents in a SharePoint library can look like a permissions or syncing issue—but more often than not, the root cause is how files were shared in the first place. Using Copy link is quick and convenient, but it can silently introduce unique permissions that break the expectation that a library behaves as a single, consistent container for documents.

There’s no single setting that prevents this, so awareness is key. If users report that they can’t see all documents, it’s worth checking for unique permissions at the library level before assuming something more complex is wrong. Resetting documents to inherit library permissions is usually all that’s needed to restore visibility.

In short, SharePoint isn’t losing documents—they’re just being shared in ways that change who can see them. Understanding that distinction can save a lot of time, confusion, and unnecessary troubleshooting.