Creo view express 3.0 opend "creo view ed" type file but only shows the model tree and can not active the model tree
Hello everyone, first of all, thank you very much for the help! 
Here is the problem: I am doing some modeling works for my client by using creo and saved the file as a copy in "creo view ed" type (it is an assebled model). I sent the "ed" type file in email to my client, but when they opened it, there is only model tree and when try to active the model tree, there shows a red cross in front of the step.
something like this,
I am thinking if it is because there is related files missing, so the model can not be showed. My teacher suggested me just save all the "prt/asm" files as a backup and send them to the client,
I did, and this time it works, but what is bothering me is that there are too many files if I saved as backup, it is not convenient for the client to download them all.
So I would like to ask if there is any other solutions that I can save my model as a more simple file type that the client can also open it successfully?
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