I understand these use cases, but I'm not sure the attachments related to these things are already in my email frequently enough for this to be useful.

My voicemail is on my cellphone or in Google voice (where it already has a humorous machine translation that might be good enough.) If I want to take a picture of a product, the closest camera is in my phone and there's already an Amazon app for that.

Perhaps you could de-emphasize the "attachment" part, which makes me think of files and serious emailing, and emphasize "send a picture" which I can do quickly from my phone. I know it's the same thing, but the different wordings send my brain in different directions.