Add note about Identify events generated by the CSV uploader

Author: joeynmq

src/engage/profiles/csv-upload.md

@@ -4,6 +4,9 @@ plan: engage-foundations
 ---
 You can use the Profiles CSV Uploader to add or update user profiles and traits. This page contains guidelines for your CSV upload and explains how to upload a CSV file to Engage.
 
+> info ""
+> When you use the CSV upload feature, Engage generates internal Identify calls via Segment's Tracking API and sends them into the [Engage output source](/docs/unify/debugger/). 
+
 ## CSV file upload guidelines
 
 Keep the following guidelines in mind as you upload CSV files to Twilio Engage: