This isn't the first work Prince Harry has done in the area of mental health. The caption on the post read, "Coming soon".
William, Kate, Harry and Meghan rejoined forces to narrate a three-minute film for the National Health Service (NHS), encouraging Brits to look after their mental health.
Viewers are then taken on the doorsteps to what looks like Harry's house, where Ed rings a doorbell playing the tune of God Saves The Queen. Be willing to ask for help when you need it and know that we are all in this together'.
"Hey mate, nice to see you", says Harry.More news: What's New in Windows 10 Cumulative Update KB4517389
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Footage shared on the SussexRoyal Instagram account begins with a spoof misunderstanding between the red-headed pair, with Sheeran declaring he is there to write a song to raise awareness "for people like us".
The "Shape of You" singer asks if he can bring his camera man in, and Harry responds, "Of course, come on in", before the screen cuts to black with the message, "Tomorrow 10th October". "All over the country, millions of us face challenges to our mental health".
"People just don't understand what it's like for people like us", Ed says, and a confused Harry says, "Wait, what?"
As the video draws to an end, the father-of-one, who can be sitting on a sofa with Ed, says: 'Guys, this Mental Health Day, reach out, make sure your friends, strangers - lookout for anyone who may suffer in silence.
The style of the front door and a photo hanging on the wall hint that the video was filmed at Ivy Cottage, Princess Eugenie's home within Kensington Palace where she lives with husband Jack Brooksbank.