MetaData

If any user uploads any document and it remains checked out to the user, then no one else will be able to see that uploaded document because it was never checked in. Even the site owner can't see those  documents. There is an easy way to handle this situation. The site owner can go to the Document Library Settings page and click on the link to Manage checked out files. From here, can select the documents and click the Take Ownership of Selection link. Now, the site owner can enter the missing metadata and check the documents in so others can see them.