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It starts to do so but gets stuck.
The issue is that one of your browser extension ‘Grammarly’ is inserting tons of code into the editor without you knowing when you created your campaign, see the HTML code below:
Here's what you need to do:
1) Disable Grammarly extension in your browser
2) Re-create your campaign (not just “Duplicate”, create a new campaign and write your message)
Then send your campaign again.