Two simple video dimensions question.

Howdy.  I have poked around to get these two answers - maybe I am overlooking them.

(1)  I'm asking about the size of a video to bring into Storyline, but not (a) file size nor (b) length.  Just dimensions.

If I understand this correctly, a 16:9 Storyline will have dimensions 720 x 405 in pixels.

I'm used to publishing video at 1920 x 1080 (having shot in 4k, if that matters).

But if I am publishing to drop a video into a Storyline slide, even to take up the whole page (as I sometimes want to do), then it seems like I should be publishing at 720 wide (at most).  Am I right about that? (By the way these are talking heads interviews, if that matters).

(2) I have been experimenting with the topic above.  However, this unexpected thing is happening: when I import a video I have published to a specific (smallish) size, the dimensions of the video in Storyline do not match the dimensions I gave the file when I published it.  Another way to say this: the dimensions of the imported video in Storyline do not match the dimensions I can read by looking at the listing on my hard drive doing the usual right-click>propertes>details thing and reading the specs.  I am uploading a screen grab of what I am seeing (or think I am seeing).

Thanks for any guidance on either of these questions.