Problems with UDIM Tiles in Blender

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IIRC UDIM logic in Blender is usually from bottom left

  • 1001 = bottom-left tile
  • 1002 = tile to the right
  • 1011 = tile directly above 1001

If that isn’t what’s happening you could try flipping the Y axis on build exports

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I see that there may be a bug worth reporting for UDIM exports ( maybe more) tht flip Y here doesn’t work.

In that case my advice would to run a post script to configure files after it is done.
or use this method if you dont want to make your own.