if you store Adobe Stock images in you library, the Adobe CC Libraries don’t show the the content_length of the primary presentation.
Only the renditions has a content_length element. However the renditions are limited by size. The JPG rendition has height of 240px.
I’ve seen that the Adobe CC app shows the size of the element if you open the infos on the right side.
I’m working on an integration, where I have to provide the correct size to the solution so that the solutions knows it has correctly load the asset.