The lesson
Announce a raise in three short lines, then put the long version in an image so the post stays readable.
The post reads: "Today, Ramp raised $1.85B at a $60B valuation." Then "Seven years ago, Karim and I wrote our mission on a Post-it: “Save companies time and money.”" Then "Our mission hasn't changed. It’s just gotten bigger." Below sits a signed letter, "Ramp at $60 Billion: The End of the Beginning", with the mission line highlighted in yellow.
Don't copy the figures or the signature. Keep the plain three-line text and the attached letter with one highlighted line.