Part not displaying in Preview mode

[Johnm]

Hi, I have the issue that my current part I can edit, etc. but does not show in the preview build mode. So,I am using Simplify3D v5.1.2. I am designing in Shapr3D on the iPad. If I create a new session/project and then Import the Model it works correctly. Maybe it is after I Delete and Import a newly edited part it sometimes imports correctly and works correctly and sometimes I can edit the model just fine but it will not display the model in prewiew mode. I am not sure if it is solly an issue with importing a new model. I can still play the preview file but it just does not show the object. I tried importing another part into the same project but that part does not display in preview either. I attached the Project that is having the issue.

Thank you

[S3D-Taylor]

I was able to slice and preview the file without any issues. Did you perhaps turn on Preview by Line and checked 'Only show 1 line' by any chance? (see screenshot)
If not, please attach a factory file so I can take a look at it instead.