Etsy has carrier support for Yunexpress, which is an old version of a carrier's tracking system,
I tested YunExpress with a tracking number and it is working for tracking updates when manually filled with the API 'carrier_name' 'yunexpress' -- When the links are clicked they take the user to the website: https://www.yuntrack.com/ -- this is the old yunexpress tracking site.
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YunExpress in the North American and EU has changed their branding and name over to Cirro Ecommerce with a new tracking website: https://www.cirrotrack.com/
Etsy needs to update Yunexpress in the etsy system to Cirro or and correct the tracking link to https://www.cirrotrack.com/
OR add support for Cirro eCommerce separately using the new tracking site.
Cirro is already supported on Aftership so should be a quick add
Cirro on aftership: http://aftership.com/track?c=parcll
Hilariously this week I tried again (for the probably 100th time) to talk to support about this and I got a semi competent person who directed me to this feedback link to suggest carriers to etsy.
Why it took years of asking to get this...is unclear. But other can now know about this hidden suggestion link?
https://survey.alchemer.com/s3/7650632/Etsy-Feedback-Form-jaf267ho6w
amusingly they have carriers they dont list. So they MIGHT have cirro, but dont publish the list of how to actually connect to it.
UniUni is now available (manually as Uniuni)