Change the icon of an Alias in macOS Sierra?
I can't seem to get the icon of any aliases to change in macOS Sierra. I open a PNG image in Preview, select all and copy. I then do a 'Get Info' on an alias, select the icon in the top left corner, and then paste the copied image. The icon for the alias doesn't change, but the file size of the alias does change.
I have also tried creating a '.icns' package. I can drag and drop this onto a folder's 'Get Info' icon and it changed immediately. This does not work for aliases, though.
Does anyone have any insight into this? Am I doing something wrong? Is there something special that needs to be done for aliases or is it just not possible to change their icon?
MacBook Pro with Retina display, macOS Sierra (10.12)