# Multipart Upload Init

**POST** `/v1/utils/S3multipart/init`

Initiates an S3 multipart upload session for large assets (e.g. video files or large archives).

Returns a secure `uploadToken` and `uploadId` to be passed in subsequent chunk upload and completion requests.

### Response fields

**result** Array of initialized upload sessions, each containing `uploadToken`, `uploadId`, and destination `fileUri`.