When a file is copy/pasted into an email - using Actions → Copy to clipboard and pasted to our gmail system - and sent to a freelancer, sometimes the green insertions and deletions do not display with the shading - it all comes in as regular text. We have reproduced this with a user opening the email we sent in Outlook (AOL and gmail were fine). Insertions, deletions, notes mode should be visible in email of all common email systems, not just gmail.
Thanks for submitting this! We'll keep this in mind as we make progress how Composer interacts with other tools and email systems.