I converted my html file to master page successfully and it gives me following message on preview page:
your master page doesn't have any warnings or errors.
But when I browse "Edit Master Pages" from design manager it is giving following message against my html:
Warnings and Errors.
Secondly, I am not able to see the new master page in drop down for selecting it as a default master page in site settings.
Any one faced this issue before, whats a way out of this