This is hopefully a simple question since I was able to do this on another file, but now I can't remember how I did it. I'm using
3.7.15 beta.
Basically, in the image below, I want to put a sequence of images under "HeadSlot" and have them match up.

So, I select them in hierarchy view and drag them to HeadSlot. Below you can see the results with the first image in the sequence selected. It defaults to rotated 90 degrees (to counteract the bone I presume) and centered on the Headbone.

However - this might be a bug - not all images come in with the same transform, as the last image in the sequence is rotated 270 degrees, even though it appears upgright. If i change it to 90 degrees, it becomes upside down. I could get around this by using world transforms only but I can see how it might cause an issue if for whatever reason you needed them all to have the same local orientation.

Furthermore, I want to have the images shifted upward so that the Headbone is at their base. But when I transform one of the images, the others don't follow. In this case I only have 8 images but there could potentially be hundreds; what is the preferred way to move an entire image sequence so that they stay aligned?