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Where are you uploading it. Sometimes you need to provide texture images separately with model, even if they are applied. If you are exporting in .fbx, make sure you are copying texture in export settings.
sorry for the late reply, there was no notification. yes i did copy textures in the fbx export settings but still got the same issue.
Are you packing all the textures into blend file before exporting. Go to file- External data- pack into .blend. If you are doing this too, then I don't know what's wrong.