We don't handle TIFF review. Can you put up a PNG screenshot instead?
Show diff/interdiff links from rbt post output
Review Request #5434 — Created Feb. 8, 2014 and submitted
This will add the diff url to the rbt command line after the review request url and it fixes the issue 2929.
I have tested this multiple times on my command line, when posting review request via rbt. I also attached pic about the test case.