Upload a brand image to the organization gallery. POST
Upload a PNG, JPEG, or WebP brand image. The server normalizes the image, strips EXIF metadata, and stores one standardized WebP image for rendering. Organizations are capped at 12 brand images.
Upload a requested pre-boarding document. POST
Uploads a document the new hire was asked for (multipart form with `itemId` and `file`, at most 20 MB) through a pre-boarding token link and completes that checklist step.
