​@Vivian Kuo Broadcasting in Instagram is not recommended. You would only be able to broadcast to people who interacted in the last 24 hours, and Instagram is not made for Broadcasts.

My suggestion is that you use automations with Smart Delays to set up your logic and sent automated follow up a few hours after their initial interaction.

As for the Export Custom to System Field feature, works only to export information that you have on a Custom Field to a System Field (Email and Phone). So you need to have their email/phone on a custom field, and want to export it to the System Field.

If you have contacts with the Email System Field and Email Optin setup, then you can use Email broadcasts to your audience.

Hope this helps!

​@Gustavo Boregio Oh no! Is there any way to export a list of followers who have interacted with me in the past?

​@Vivian Kuo you can export their data to a Google Sheet. Here's some documentation about it:

https://help.manychat.com/hc/en-us/articles/14281248811292-Google-Sheets-integration

​@Gustavo Boregio where can I find the button of “google sheet”?
Is it because Instagram does not allow exporting to Google Sheets?

​@Vivian Kuo you need to connect it first:

Make sure you follow all the steps here: https://help.manychat.com/hc/en-us/articles/14281248811292-Google-Sheets-integration

It's all there ;)

​@Gustavo Boregio 
My setting doesn’t show the Integrations, and I can’t tap the button Connect Google Sheets Account QQ
 

​@Vivian Kuo got it!

You need to have a PRO account for integrations. They are not available in the Free plan.

Upgrade to Pro and you'll be able to connect to Google Sheets.