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Order-entry shortcut: when masking is toggled ON for an Express order line, an amber "MASK" button appears to attach reference image(s)/PDF(s). The files ride the existing _fp_apply_express_overrides_to_job path onto the job's masking step, so the operator sees exactly what to mask — no recipe edit or custom prompt needed. - configurator: masking_attachment_ids on the wizard line + SO line; action_upload_masking_ref; override branch writes refs onto mask steps; amber multi-file MASK button (express_action_btns) shown when masking is on. - jobs: x_fc_masking_attachment_ids on fp.job.step (per-step) + computed rollup on fp.job; office "Masking Refs" form page (readonly preview). - shopfloor: workspace step payload carries masking_refs (sudo'd attachment read, rule 13m); operator sees thumbnail/PDF tiles on the mask step that open in Odoo's full-screen FileViewer (zoom + swipe). Verified end-to-end on entech: SO-line refs land on the mask step + job rollup (WO-30091); payload mask_refs shape correct (is_image, /web/image). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>