Your image stays on this device. Use a screenshot showing the complete puzzle board.
Physical disc stacks
Build bottom to top; take discs from the top.
JSON export
Screenshot & extracted colours
Screenshot
Extracted colours
Screenshot order, bottom to top.
Your ten disc colours
Tap a disc to change its colour. Tick Black or White to add stripes. Changes save on this device. Each screenshot colour gets its own disc, in palette order. Physical stack order is reversed.
Save as the repository default
Export your palette, then run make palette-default PALETTE=/path/to/palette.json in the checkout. Commit the updated src/default-palette.js to publish it.