[STL files only appearing as a shadow in Cura. How can I fix this?]

I find it a little odd as well. But I'm still relatively new to using Cura, and 3D printing as a whole so I'm not even sure where to start when it comes to trouble shooting something like this.

 

I've attached the 3mf file as you instructed, and I appreciate your help.

1280387243_CE3_FrontwMouth.3mf

[STL files only appearing as a shadow in Cura. How can I fix this?]

Thanks for the help and the suggestion. I looked into it and the Z is set to 0, so the model should be on the build plate, and the preferences are currently set to "Automatically drop models to the build plate". Cleary its acknowledging that the model is there, its just not displaying like its supposed to. Any other thoughts on what it might be?

[STL files only appearing as a shadow in Cura. How can I fix this?]

I've used a lot of STL files with Cura up to this point, but recently I've had some issues with STL files only appearing as shadows when dropped into Cura (see attached picture). 

The STL files  that I've purchased from the Do3D website seem to have this issue more than others, and I have no problem opening them in Meshmixer or Slic3r. But when I try to open them in Cura and slice them, they just wont cooperate.

 

Does anyone know how I can fix this?

 

Thanks