Merge pull request #5618 from segmentio/lizkane222-patch-35

Update index.md CSV Download Accounts update

Author: rchinn1

src/engage/audiences/index.md

@@ -229,6 +229,9 @@ Note the following limits for the CSV downloader:
 > info ""
 > Generating a CSV can take a substantial amount of time for large audiences. After you generate the CSV file, leave the modal window open while Segment creates the file. (If the audience recalculates between when you click Generate and when you download the file, you might want to regenerate the file. The CSV is a snapshot from when you clicked Generate, and could be outdated.)
 
+> warning ""
+> You can't add account traits and identifiers using the CSV downloader with account level audiences. This is because every row listed in the CSV file is a user, and since account traits and identifiers only exist on accounts, they wouldn't exist as a user's custom trait and appear on the CSV.
+
 ## Identifier Breakdown
 
 The audience summary is a breakdown of the percentages of external_ids of users in the audience. These are the default IDs that Segment includes in the Identity resolution configuration. Segment displays the percentage of the audience with each identifier, which you can use to verify the audience size and profiles are correct.