Sprite atlas for asset bundle being loaded with main build + images not displaying?

Hi guys, I decided to start a new thread because the subject moved from image compression to sprite atlas.
Here's my setup.

1. I created an Asset Bundle from a scene. https://i.imgur.com/6QFFheF.png
2. The scene contains a bunch of images. https://i.imgur.com/OhdlrsA.png
3. I created a Sprite Atlas for the images and checked "Don't include in build". https://i.imgur.com/eN2ykXk.png
4. I cannot drag the Sprite Atlas into the Asset Bundle, because it seems you cannot manually add files to an Asset Bundle that is created automatically from a Scene. If I try that, I get those red error messages. https://i.imgur.com/tXqnLqX.png

Now I have two issues:

1. The entire Sprite Atlas is loaded into memory when I start my game, even without loading the Asset Bundle. There are no pictures in the Sprite Atlas used by the game's main scene. https://i.imgur.com/YNy3W8W.png
2. When I load the Asset Bundle, the images from the Sprite Atlas are not displayed (however it looks like they are 'found' in the inspector, they are not Missing). https://i.imgur.com/UeOgmWk.png