400 Bad Request

[roy-work]

+ docker save -o ci.docker docker.cloudsmith.io/[owner]/[repo]/[image]:[tag]
+ printf 'Pushing to Cloudsmith…\n'
Pushing to Cloudsmith…
+ cloudsmith push docker [owner]/[repo] ci.docker
Checking docker package upload parameters ... OK
Checking ci.docker file upload parameters ... OK
Requesting file upload for ci.docker ... OK
Uploading ci.docker:
ERROR
Failed to upload file! (status: 400 - Bad Request)

And that's all the info we get! This is not a useful diagnostic: I have absolutely no idea what I've done wrong here.

(Currently attempting to re-run this w/ --debug to see if I can get enough info to piece it together. --debug emits too much data to be useful.)