importing image resolution mismatch

I am confused about what is happening when I import a jpeg image into Animate Pro. My image is exactly 1920 x 1080 - same as my animate pro scene settings - but when I import an image with default settings, the resulting import exceeds my default camera layer border by a substantial amount.

I know that I can resize easily - also realize that I can import as a jpeg “to fit”, but I’m not sure why I would have to do this if the images I write out match my scene settings. Anybody know what exactly is going on here?

Internally the software uses a 4/3 aspect ratio for historical reasons. Bitmaps can be aligned using the element editors alignment rules and vectorized elements are mapped to size but are usually displaced and modified anyway so this is really mainly a BG issue in most cases.