# Upload file content

Uploads file content for an existing upload session.
Upload Process: - Upload content reliably with automatic error handling - System tracks progress automatically - Optional content integrity validation via checksum - Processes file when upload is complete - Creates content record upon completion
Upload Flow: 1. Upload content using multipart/form-data 2. System processes content reliably on server 3. When upload is complete, assembles into complete file 4. Stores complete file in secure storage 5. Creates content record in database 6. Cleans up temporary files
Error Handling: - Invalid content is rejected with detailed error messages - Failed processing triggers automatic cleanup - Session expiration prevents orphaned files

Endpoint: POST /content-upload-sessions/{sessionId}/chunks
Version: 1.0.0
Security: bearerAuth

## Path parameters:

  - `sessionId` (string, required)
    Upload session ID
    Example: "123e4567-e89b-12d3-a456-426614174000"

## Request fields (multipart/form-data):

  - `chunk` (string, required)
    Binary content data (max 900KB)

  - `chunkNumber` (integer, required)
    Content sequence number (1-based)
    Example: 1

  - `checksum` (string)
    Optional SHA-256 checksum for integrity verification
    Example: "a1b2c3d4e5f6789..."

## Response 200 fields (application/json):

  - `sessionId` (string, required)
    Upload session ID
    Example: "123e4567-e89b-12d3-a456-426614174000"

  - `chunkNumber` (number, required)
    The chunk number that was uploaded
    Example: 45

  - `uploadedChunks` (number, required)
    Total number of chunks uploaded so far
    Example: 45

  - `totalChunks` (number, required)
    Total number of chunks for this file
    Example: 100

  - `status` (string, required)
    Current status of the upload session
    Example: "uploading"

  - `isComplete` (boolean, required)
    Whether all chunks have been uploaded

  - `contentId` (string)
    Content ID when upload is completed
    Example: "987e6543-e21b-43d2-b654-321098765432"


## Response 400 fields

## Response 401 fields

## Response 403 fields

## Response 404 fields

## Response 413 fields