How to export .bna file from the Hyperledger Composer Playground
Alright, so you've built your .bna file either with the official hosted playground or your own hosted playground. Now it's time to export it.

Step 1: Deploy changes
Hit the "Deploy changes" button. When it becomes grayed out, proceed to the next step.
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Step 2: Export the .bna file
Great! So now that we've finalized our changes, it's time to export our file so it can be deployed to our blockchain. To do this, hit the "Export" button.

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You're done!
When your browser is finished downloading the .bna file, it can be deployed to your Hyperledger Fabric blockchain.

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