How do I attach a file to contact in Outlook for Mac?

You are looking for the Windows contact-note attachment feature, but Outlook for Mac does not expose an equivalent command for attaching arbitrary files to a contact. Microsoft’s Mac contact editor supports contact fields, notes, and a photo, while attachments apply to email messages rather than contact records. A supported workaround is to store the document in OneDrive or SharePoint, copy its sharing link, and paste that link into the contact’s Notes field. Restrict the link to the intended people if the file is sensitive, and test it while signed in as the expected user. If several files belong with the contact, link to a dedicated folder instead of maintaining multiple attachments. Save the contact, close it, reopen it, and confirm the link remains in Notes. If your workflow requires files embedded inside contact items for offline use, that remains a Windows-client requirement; Outlook for Mac cannot currently reproduce it.