@Sonnyof42
Decided not to wait for the weekend. Downloaded Win version of TT, installed it in Win10 in Parallels Desktop, copied the TT file from my Mac over there, created C:\attachment, put Form1116ScheduleB.pdf in that directory and transmitted. SUCCESS!
Copied the TT file back to Mac and opened it and it shows as eFiled there.
I'm pretty amazed that you can move the TT file back and forth between Win and Mac so seamlessly. Now to just wait for an acceptance message and I'll be all set.
Thanks for the inspiration to try this and to @LarryDean for the huge hint on where to stash the PDF file.
Now only hoping that the PDF attachment doesn't put the return into long-wait-limbo at the IRS. 😉
