Here are some consecutive frames from that animation:These frames show the fully loaded clip being pushed down and locked in place. There are six (count them) cartridges in the clip and they are all below the bottom of the receiver chamber and the level of the bottom of the bolt. This is also shown in blabbermouth's video. Simply place a seventh cartridge in the receiver chamber and slide the bolt forward. The seventh cartridge will be pushed into the firing chamber (in lieu of the top cartridge in the clip). This is also what Frazier testified.
I believe that the dark area at the extreme right of the photo is the stairway wall going down to the fifth floor.... There is a dark haired woman who is wearing a COVID mask facing east at the left side ( east side) of the photo ....I wonder why they didn't place the boxes as they were when Weitzman and Boone found the rifle ?
Here is link to Google Drive with a few more images from that series. These are big files – just letting you know.https://drive.google.com/drive/folders/1CAEiRlZQMxelunN3koMA0q2LRR8lo7lS?usp=sharing