Currently by default, both the data erasure and data portability features only identify content when the user is the creator or last modifier of an asset. We can potentially increase the effectiveness of identifying personal data by searching the index for clearly known identifiers (like name, email address, phone number, etc).
For example, we can search the index for "email@example.com" which may return a Word document authored by Dennis Ju but uploaded by someone else.
In regards to the UI, this could possibly be an optional search in addition to the current step 3 of the wizard ("Review Personal Data"). Or perhaps both the search and step 3 become optional actions if we move away from the wizard format (