New answers tagged asset-management
This appears to be a bug in the application which has been reported here. (I am the Product Manager responsible for this feature, so I would love to be able to fix it in the next release!)
That's certainly curious. I just tried it with a vector smart object as you have in your image and I was able to add different formats quite easily: It might be worth reporting this to Adobe as a potential bug with this new dialog.
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