Thanks. I took a look a the file. The preparations are Inventor Assembly Features. Importing them is not yet supported in Publisher, but is being considered for a future release. I also looked into the fastener issue. By fasteners, I assume you mean the "Hexagon Socket Flat..." instances. These are being imported into Publisher, but the iMates are not yet being imported, so i think they are all showing up inside your model. You can see them by turning the visibility of the root component off, and then making just one of these screws visible. Importing iMates is also being considered for a future release.
I hope this explains the behavior you are seeing. If not, please let me know. We appreciate your feedback. I will let our Product Manager know that you are requesting these features for a future release.