Modifying a draft without downloading attachments

Question

I have a draft saved on my Gmail account, containing an attachment. At a later stage, I realise that I have to add some text to the mail, via the Gmail API. At an even later

Answer 1

No, unfortunately there doesn't appear to be a simpler alternative at the moment. I'm not sure what API changes would be needed to support that use case, but you can file a feature request and we can talk to the team about it.