A folder-picked Fortnox export failed 50 of 50 attaches with
UNDERLAG_REF_MISMATCH although the preview had matched every file. The
preview is built from File.name, a bare filename by spec, while the attach
route read the multipart filename, which Chrome fills with the folder-relative
path for folder selections (2026/06/Leverantorsfakturor/A166_x.pdf). The
guard that requires a file to land where the preview said compared the
previewed basename with a path the parser cannot read, and refused.
The route now reduces the multipart filename to its basename once, at the
boundary, before the resolver check and before archiving, so the archived
file_name is the name the user reviewed rather than a path. The parser keeps
its no-directory-stripping rule: the manual-reference box shares it, and a
typed 2024/01/31 there is a date, not voucher 31. Both separators are
stripped; nothing else is normalized.
Claude-Session: https://claude.ai/code/session_014uwXchJvF5YMgz8vRfuxLe
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
