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I tried to make the file smaller, but it doesn't get significantly smaller even with the decimate property. To clarify: I want to download the animations from Mixamo because there is difference between exporting FBX from Blender and exporting FBX for unity from Mixamo. I want to re-upload to Mixamo to export as FBX for unity. I read through all of the other similar posts with this topic, but I cannot export as an obj file, because I don't want to export my animations from blender (where I could add the textures later on). It says "Unable to map your existing skeleton". I downloaded an FBX file from Mixamo, edited the texture in Blender and want to re-upload it back to Mixamo, but I doesn't allow me to.