Posting on behalf of a customer:
Currently, I can copy and paste a list of comma separated values (such as emails) into the PX engagement targeting. In order to get this list, I have to have a certain version of Excel or manipulate the list in Sheets. Instead, I would like the ability to simply download the CSV file from another system, then upload to PX and select that I want the engagement to be targeted to the email addresses in the list, for example.
Business case: Sometimes, I want to get an engagement out quickly but the targeting I need is in another system. Rather than waiting to get a custom attribute, etc set up, I need to quickly get this information and target it within PX.