Upload resources fail with 410

I have mobile app that hasn’t been update for a while and it’s still using ionic CLI 3.19.1. I need to make some changes now and when building the app I am getting error at the step when it tries to generate the resources by reaching out ionic api (https://res.ionic.io/api/v1/upload). The error status is 410, has the api url been retired and do I need to upgrade to higher version which I would prefer to avoid.

Thanks

The Ionic resources command was shut down some time ago. We instead moved the processing over the user space and created this package to help.

Why not update documentation???

Since the command is the same, the only difference is the processing happens on your end vs on our end.