Uploading a bos file from the portal


I'm following along with the getting started tutorial (Travel Requests) and I am at the part where it says to export the project from within bonita studio and then upload it as a resource in the portal. However when I go to resources in the coolbar and click add, it only allows me to upload zip files. Whats up with that?

Extract java code

Is there any way to extract the entire code that makes a .bos file?