Models are not displayed in the library. Maybe I found the problem.

Models are not displayed in the library.
After a lot of experimenting, I found the problem.
1. I uploaded a Creo model in addition to an .obj file. The ".asm File" is correct, I test the download, but the viewer could not display the model correctly.
2 Parts missing, but the parts are uploaded.
Consequence. The model disappeared from the library.
2. I had uploaded a photo with snowflakes in the foreground of the model.
Consequence. The model disappeared from the Library.
After deleting both unwanted parts, the model was back in the library.
This model was affected. Organ