Unable to communicate with Lightroom.
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Lightroom is generating previews on demand. This is slow on cold collections (10–60s per photo). To speed up: in Lightroom's Library → Previews → Build Standard-Sized Previews.

## A note about sort order

## Keyboard shortcuts

? | Show this overlay
Space, →, Enter, click | Generate pair
← | Back
X | Swap sides
[, Shift-click left | Generate left side
], Shift-click right | Generate right side
+ [ | Reveal left photo in Lightroom
+ ] | Reveal right photo in Lightroom
S | Save pair
F | Toggle fullscreen (distraction-free)
L | Bring Lightroom to the front
R | Refresh Library snapshot
Esc | Close this overlay

Show button bar at the bottom