In his article "The Hot Potato Process”1, Dan Mall advocates for a truly collaborative workflow.
... great collaboration follows what Brad Frost and I call “The Hot Potato Process,” where ideas are passed quickly back and forth from designer to developer and back to designer then back to developer for the entirety of a product creation cycle.
This fosters better outcomes through constant iteration and communication.
Sitting together, whether in person in remote is the key to this. If this isn't the case, then you're probably not working together!
If you can’t sit together in person or trade recordings or approximate these kinds of approaches, you might have to come to terms with the fact that you’re not truly working together.
The Hot Potato Process by Dan Mall