Best practices for collaboration between Premiere and Audition?

Hello, first time posting here, thank you for reading and thanks in advance for your help!

I am an audio engineer working with a video producer on a series of videos. He has been working in Premiere and is familiarizing himself with Audition, so I recently downloaded and am finding my way around Audition as well, for ease of collaboration. I do not have a subscription to Premiere. My version of Audition is also a slightly earlier release than his, as my computer OS is older and Audition will only update to 12.1.5.3 for me.

So far, we have a very clunky workflow. We've found that he can open his Premiere projects in Audition on his computer, but I can't open his Premiere projects. I assume this is because of the version discrepancy, but I could be wrong. I can open his Audition session files, however, so here's what we've been doing:

- He opens his Premiere project in Audition on his computer

- He saves that as a new Audition session with all assets in a folder

- He uploads all those assets and session file and a copy of the finalized video to Google Drive for me

- I download and open in Audition (there is an error message when I first open saying that the Dynamic Link is not valid, but it works anyway)

- I drop in the finalized video for syncing, and proceed to mix

- I send him a final mixdown of the audio, which he then drops into his Premiere project, deleting all other audio tracks.

This seems very redundant and clumsy to me, especially since I looked up Dynamic Link and saw that this process is all automated when working between the programs on one computer. Is there an equivalent process for collaboration between two computers? Perhaps using Creative Cloud, which we're not making use of at all yet? I'd really love to streamline this procedure, which is also error-prone, so that we're working within one consistent workflow.

Thanks a ton for any thoughts,

Jay