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Attachments are working again! Check out this thread for more details and to report any other bugs.
The trick turned out to be that you have to enter "atsp6", send, and only then send the "AT SH 7c0" etc.
I have a 2012 Prius and this did not work for me. After entering the "AT SH 7c0" and getting the "OK", I entered the "21ac". But instead of the...