I have a very frustrating issue with the Magento 2 sales order emails. Through experimentation, I worked out the locations of the many files that are used to comprise these emails.
At some point, I edited what I believe was
to alter the CSS there to check if that makes a difference to the resulting sales emails.
The confusion I have is that sometimes editing this seems to influence the resulting emails, sometimes not.
My question is, how do I clarify for sure what .less / .css files are being used as the source for the CSS that I believe is embedded into emails. I'm not sure if the normal css that is in the pub/static folders of magento comes into this or not. Clarification about the exact source files for email css would be great.