Unclear how to use --artifact-metadata-list

I'm having trouble discovering what to use for --artifact-metadata-list. The descriptions on this page seem vague. It would be really helpful to have some examples, or some way to learn how to use this parameter to specify which pipeline run output I want to create a release for.

So I'm trying to "az pipelines release create" but am stuck getting the error,

"Cannot retrieve the default version for artifact 'MyMobile Builds' because default version type is 'selectDuringReleaseCreationType'"

I found this, which defines ArtifactMetadata, but how to use this is still unclear. https://docs.microsoft.com/en-us/rest/api/azure/devops/release/releases/create?view=azure-devops-rest-5.0#artifactmetadata

I'm trying different incantations of things like --artifact-metadata-list id=172, trying to guess how it works, but no luck.

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* ID: f912b9b3-f27c-deb7-54c1-8e3f477ed26f
* Version Independent ID: fb24966a-f6fb-1828-2e0e-4374ae1df3d9
* Content: [az pipelines release](https://docs.microsoft.com/en-us/cli/azure/ext/azure-devops/pipelines/release?view=azure-cli-latest#ext-azure-devops-az-pipelines-release-create)
* Content Source: [latest/docs-ref-autogen/ext/azure-devops/pipelines/release.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/live/latest/docs-ref-autogen/ext/azure-devops/pipelines/release.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**