Optimizing uploaded images

Under the plugin setting for JPG quality level, it is stated “Use this to override the default WordPress quality level of 82. This only applies to edited images, resizes, and converted PNG files. Original images are uploaded unmodified”.

Given that original images are by far the largest, and that optimization is meant to be lossless, this is a strange choice.

Also, the top of the page states “New images uploaded to the Media Library will be optimized automatically”, so which is it?

Are original images optimized when they are uploaded or not?

Are they optimized during bulk operations?

Are they optimized during scheduled operations?