It was unclear at first that I had to remove the placeholder thumbnail image. Since I didn't upload anything, I was confused why my CDN image wasn't there.
The first icon (picture in picture) is strange - do you think we need it? Can we hide if we don't want it here?
Section F for reference
Tried out the code to use the first frame as poster image - looks good! Then - tried with it removed (same as 4O) and still seeing first frame.
Update: Per James, the extra code is so we see the preview on iOS devices. Confirmed - w/o code there is no poster image on iOS. Once added back in, I see it!
Used same video as 10E but no CDN poster image. Looks good!
Same video as 10F with CDN image. Looks good!
Section 4O
For this one, I did NOT put in a CDN and I removed the thumbnail. I put in the HLS link as is, did not add the code at the end to use first frame as preview. But - it appears the preview is still there. UPDATE: Confirmed this code is needed for iOS. No change to documentation or implementation needed.