What happens to images after pasting into sketch?

Question

Design

By actually inserting the image, for example, into a rectangle, through the Fill image, it was somehow scaled there. I'm interested in the following:
1. how it (the image) can be moved in the container (rectangle) and resized.
2. how to use it as a smart object so that you can normally export it in @1x, @2x and @3x sizes for retina and other displays? and how to organize such an export in a sketch?

Answer 1

1. No way (there are several preset options in the settings, no more).
2. In the lower right corner there is everything you need (Export panel, if I understand the question correctly).

Answer 2

1. Insert a mask with a simple drag'n'drop and scale as you like
2. If you have retina and the quality on the screen is completely satisfied - port via Export in the required sizes, sketch will do the rest for you