Once your CSV data has been uploaded into PostPilot you can use this data in your segments to target a specific audience. 

Step 1

You'll want to grab the Tag Key for a a CSV upload you are trying to target. 

Step 2

You'll need to have a segment (or edit an existing one) and you'll want to select "Custom" and "CSV Uploads" in the field as shown below.

Step 3

Add a "tag" filter to target identify the customers that were in the upload you are targeting.

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