Opacity map as Virtual texture because of UDIMs not working

Development Asset Creation Photogrammetry
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  1. Import each UDIM’s opacity map as a separate (non-virtual) texture.
  2. Manually offset your UV lookup for each opacity texture to match the desired UDIM offset in the other corresponding textures. Ensure the pixels outside of your offset textures are black.
  3. Add all the offset opacity textures together and pipe the result into the Opacity Mask node.