Example: I sent a music track to my sister. I don't want it using my Gmail quota which is getting close to max.
One option is to delete the thread. Less than useful.
One option is to delete just the message. But the message is quoted in other messages. I don't think this will be fruitful.
One option is 'save to Drive'
If I save to drive, is it's presence in my email replaced by a link in Drive?
Then if I delete it in drive is it gone, leaving an empty link?
The first obvious answer is 'try it and see'. But from other readings I suspect that Google is lazy about file clean up. Certainly the update time between deleting something and getting it to show up on your quota is far from instant.
I suspect this doesn't work either, that in fact there the file exists in some blob, and that in both drive and email all that exist are links to that blob.
How can I put my gmail account on a diet just losing specific attachments?
The solution has to be reasonably quick. I have 18,000 messages.