If you need to upload files to a record and have those documents or images remain private, then you will learn how to do so from the steps below:
1. Add File Privacy Option
Go to Setup > Object Manager > Content Version > Page Layouts > Content Version Layout
From the Fields section, select File Privacy on Records to drag and drop the item to the fields section under Content Detail Version
Click Save
2. Update Privacy on Records
Open the actions menu of the file you want to update and select Edit File Details. Adjust the File Privacy on Records to Private on Records.
For more information on File Security Settings, please view this article. If you have any additional questions, please contact Product Support (rethinkcrm@buildout.com).