Hey! What a frustrating situation. Here's the good news: the fact that your test email showed the new content is a strong indicator that the server has the latest version saved. The scheduled send should pull from what's stored on the server, so you're likely in good shape.

The Firefox vs. Chrome discrepancy, and your assistant seeing old content, sounds like a browser caching issue. A few things worth trying:

• Hard refresh in Firefox (Ctrl+Shift+R on Windows, Cmd+Shift+R on Mac)
• Clear browser cache in Firefox and have your assistant do the same
• Try opening the newsletter in an incognito/private window to see if the new content appears there

That said, since there's some uncertainty about what will actually go out, I'd recommend flagging this with our team directly so they can verify which version is queued for the scheduled send. Better safe than sorry! You can tag @Woody Butler here or reach out through the support channel to get eyes on it quickly.