This article tells you how to import all contacts who have ever contacted your page and those who've ever subscribed to your messenger bot via other services.
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How to Migrate Subscribers from other Services
To import subscribers from Chatfuel, Manychat, MobileMonkey and all other related services (Inboxite will also import all users who have ever contacted your page via inbox). Follow the guide below;
1. From the main menu, click on Subscriber Manager
2. Click on Sync Subscribers
3. Select the Page that you'll like to Sync and click on Scan Now from the options below.
4. Select Scan All Subscribers then Inbox from Folder the option.
5. Click the Start Scanning button and the process will begin. The system will scan your entire inbox and import the entire contacts.
Note: If you've got thousands of subscribers, it is advisable to import in batches (preferably 5000 subscribers per batch). Alternatively, enable the background scanning and the system will import your contacts in the background.