Modified images, Media folder and caching

The CMS Questions
1

If I modify an image, and keep the file name the same, and this image is already in the Media folder, will the old unchanged image be displayed?

Or is Kirby able to know the image has been changed and therefore recreate new images in the Media folder?

2

I think it would pick up the change - have you tried this?

3

It will recreate the media/thumb file if e.g. the modified timestamp of the original file changes.