Img_2777.mov -

"New video alert! Just shot something special and can't wait to share it with you all! Stay tuned for the big reveal #newvideo #comingsoon"

"Just captured a moment I'll treasure forever [IMG_2777.MOV] Can't wait to share it with you all! #newvideo #capturemoment"

However, if you'd like a more generic post that doesn't reference the file name: