Question:

What is Duplicates Skipped when a user add Attachments in PromoMats and Medical?

Answer:

When a user adds an attachment within a document, Vault detects if other previously added files are the same in the targeted document.
If Vault detects a duplicate file, Vault skips the file and the below warning message appears: 

The file does not appear in the Attachments section.

The action is not recorded in the Audit Trail of the document affected.

Note: Vault evaluate the checksum for duplicates, and the filename only when existing attachments are waiting on MD5 checksum calculation.

If a user tries to add a duplicate attachment with the same content but renamed it differently, Vault does not prevent the user to add the file. 

Related Documentation:

Vault Help Documentation: Working with Attachments

Knowledge Base: How to Add Attachments in PromoMats and Veeva Medical?