export to sketchfab udims problem

I have a problem with my export to sketchfab. i have 3 tiles of udims. I sucessfully export the model with 3 materials( not optimal but will work) there is a problem however with third tiles material. I try to change the setting in sketchfab material setting but no luck. i was wondering if it is something i did wrong with the export or the udim. If the problems is on sketchfab and not on painter just let me know.