STP files

Not sure what the spec says,

I did a test of a Step out and Step in and the imported file had no material set.

But material could be an optional piece of the output that PTC does not transmit.

I have a Step file from someone and it has color in the file, but my test file does not.

Hi the following article drops some hints : https://www.ptc.com/en/support/article/CS59472 

Hi @GeneGoldenberg,

I wanted to see if you got the help you needed.

If so, please mark the appropriate reply as the Accepted Solution. It will help other members who may have the same question.
Of course, if you have more to share on your issue, please pursue the conversation. 

Thanks,
Anurag