Fixed in release-7.1.x (0ac1560). This will ship in Review Board 7.1.0
This is a feature in 7.0+: https://www.reviewboard.org/docs/releasenotes/reviewboard/7.0/#binary-files-in-diffs You'll have to get your org to upgrade.
This is a feature in 7.0+: https://www.reviewboard.org/docs/releasenotes/reviewboard/7.0/#binary-files-in-diffs
You'll have to get your org to upgrade.
