When you are uploading a file to a person record, you can set the file classification (security) for that file, but you might notice that all of the classifications available in your system are not available on the classification list to choose from. It will display classifications in which:
- The Classification "Table Name" is be blank
- The Classification "Table Name" is "Person"
Here's a screenshot of the Classifications Query, with pointers to the records that fit these criteria:
This logic ensures you won't attach a file to a Classification that was set up for a different record type.
More information about this can be found here