Circle V2 API Docs
    Preparing search index...
    NativeFieldsProbeReason:
        | "caller-pinned"
        | "acroform-fields"
        | "no-acroform-fields"
        | "encrypted"
        | "xfa"
        | "unreadable"

    Why a run was submitted for AcroForm-only import, or was not. Every value except acroform-fields submits flat-page detection, but they are kept apart: no-acroform-fields is the rung working as designed, while encrypted/xfa/unreadable are a silent downgrade worth being able to count.