Initialize a new file upload session. This request prepares the backend and generates a pre-signed URL for S3 storage. Depending on file size, the upload may be single PUT or multipart (requiring UploadId). Use this endpoint as the first step when uploading files for indexing and redaction.
Upload session info
Upload mode chosen by server based on size.
single, multipart Server-side upload session id.
S3 object key to use for subsequent requests.
Pre-signed URL for single part upload (present when mode=single).
S3 UploadId for multipart uploads.