Overview
When you open the main Documents tab, you will notice the first three document-related options: Case documents, Firm documents, and eSignature documents. Case documents are the documents in MyCase that are linked to a particular case/matter. They appear under the case documents tab with the most recently uploaded/saved document at the top as well as under a specific case's document tab.
From the general Case Documents, the Case column will let you know which case/matter the document is associated with.