Confidential Documents in incidents

Hello,
There is a space we can use to add Confidential notes to an incident. But currently you can only add photos to the incident. I'm looking to possible also add PDF's or other documents to an incident that are Confidential and only certain people can view them as well. Like when a device is given to Law Enforcement for an investigation we normally have to sign the Consent to search form, we receive sometimes the forensics unit intake form, the property receipt form when we get the device back, and other forms. Being able to add them to the incident incase we need to reference that incident later would be great.