Convert Photo to Grayscale in PS- exports link to ID and is showed as RGB color space
I have aphoto that i have converted to grayscale in Photoshop CC. I've quick exported it to a .png file. Then i go to an InDesign document and placed the grayscale photo in the document. When i click on the same photo the color space in InDesign comes up as RGB color space rather than Grayscale like all the other photos that i have on the document. I've saved them all the exact same way and i've only run into this problem with 2 photos recently. Any solutions and suggestions will help. The First photo is the one that should say grayscale but it says Document RGB in color space. The second photo shows that it says Grayscale in the color space 

