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Not available in v2. The sandbox guest runs without CAP_SYS_ADMIN, and it is absent from the capability bounding set, so mount cannot be performed at all — not even by root. This is a platform limit, not a feature gap.
To bring data into a v2 sandbox, copy it in with files.write or a signed upload URL, or have your code read it from object storage over the network. This page exists so the v2 docs mirror v1 page-for-page. See Migrating from v1 for the full list of removed and changed behaviour, and the v1 page for how this worked before.