Hello,
Thanks for your Patience!
Unfortunately, Canvas currently does not support Dreamweaver. It seems to be working fine for some users and not for some users. We have not been able to detect the possible causes yet but once we find it, we would definitely release an Update. Thanks for your Patience.
Additionally, we understand that you are not comfortable working with other Code Editors but we would definitely recommend you to use Sublime Text with LiveReload for better and faster WorkFlow.
Meanwhile, do let us know if we can help you with anything else or if you find any other issues with Canvas.