Artifacts in Azure Devops Pipelines

Question

I have an azure devops pipeline that publishes output like this:

steps:
- script: ./something.sh
  displayName: build
- publish: $(System.DefaultWorkingDirectory)/app/build
  artifact: MyPackage

It is working properly and it publishes a build artefact. But it doesn't seem to be visible on the Artifacts page of Azure DevOps.
Is there some way to publish the artefact on the Artifacts page?