Data masks in relation to environments

Not applicable

From what I can see, the concept of an environment doesn't enter into the definition of a data mask configuration, either at the proxy or the organization level.

To confirm: A data mask doesn't need to be propagated from one environment to another. For a proxy, once a data mask is created, it immediately applies to all revisions of that proxy in all environments. Is that correct?

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Yes data masks are available only at org or API level. They work across all environments in an org.