Do you have an example URL? Images should be fully responsive as set by the Template CSS.
Usually something like:
.img {
width: 100%;
height: auto;
}
You mean for example setting out a Page layout by determining what Blocks go on the page and where? If so, yes If not, please let us know more information here and we'll see what we can do.
This is not known and could be a bug with the Editor. If you set it again after the link does it work? Can we have a little more information so we can replicate it?