Contact notes are date and time stamped and can house numerous details making them a great way of capturing supplemental information like files.
The file types that can be attached are: .jpg .jpeg .gif .png .pdf. .doc .docx .xls .xlsx .csv or .txt.
Once on a contact record, navigate to the notes tab and from there you can create a note and attach a file to be saved on a contact record.
Each contact note can have one attached file, and after saving the note, you can download the attached file from within the note history section.
While you can't change files once they've been attached to a note and saved, if you find you've attached the wrong file just delete the note and create a new one with the correct file. Raise your hand if you've ever attached a picture of your dog being cute when you meant to attach the latest program development document.... no one? Just me?