Publishing a form — Collect files

Put an Attachment field on the form and visitors get a dropzone: up to 10 files of 10 MB each, uploading as they are picked so a large file never stalls the submit button. Files are parked until the submission actually happens, and the browser is handed nothing but opaque ids — the name, size and type that end up on the record are read back from RowFold's own rows at submit, so a borrowed or invented id resolves to nothing rather than to a stranger's file. Anything picked and then abandoned is deleted, bytes included, about six hours later.