Upload Attachment

Upload a file attachment to a template.

role sets the attachment's file_role — defaults to 'reference'. The video-template worker passes 'source' to durably retain the normalized transcript + original source files (the oracle the Audit Lab grades the SOP against), so they survive job-artifact cleanup and render in Reference Files. Only the upload-time roles are accepted here; 'fillable'/'process_map' are assigned later by the classify/extract pipeline, not by the uploader.