Select your remaining texture in the Texture List to highlight it. While holding down the Shift key, press the X button next to the Texture Data Block to delete it. Select the second texture in the Texture List to highlight it. The bottom texture is actually a transparent Alpha texture and appears to be a bug. In the Properties panel, navigate to the Texture tab, you will note that your texture has duplicate names in the Texture List. If you are doing this now, you may have to re-scale your model before proceeding. JME3 uses 1 WU = whatever you determine but meters will make things easier for all aspects of your modeling. Adobe uses centimeters for the FBX exporter and if this is not set the models scale will be unusual to say the least. MOST IMPORTANT OF ALL, in the Properties Panel Scene Tab Units Panel set the Unit of Measure to Meters and the Length to Metric. You have applied the Location, Rotation, and Scale to your model. It isn’t required by Mixamo, just makes your models cleaner for jme.

It isn’t required by Mixamo, just for loading your model into jme.

You have your materials and textures done for your model. Your models origin is at the base of the mesh. It isn’t required by Mixamo, just for loading your models into jme. Some exporters other than Ogre, have an option to apply the modifier on export.

Mixamo blender animation