> ## Documentation Index > Fetch the complete documentation index at: https://docs.trackplay.io/llms.txt > Use this file to discover all available pages before exploring further. # Start a resumable upload > Starts a resumable upload session for one orientation of a video. Send the file in 8 MB chunks with `PATCH /uploads/{upload}`, then finish with `POST /uploads/{upload}/complete`. The session expires 24 hours after it is created. For files under 100 MB, the single-shot upload endpoint is simpler. Requires a token with the `videos:write` scope. ## OpenAPI ````yaml /api-reference/openapi.json post /videos/{video}/upload/init openapi: 3.1.0 info: title: TrackPlay API description: >- Send conversions and events to TrackPlay, and read them back. Authenticated with scoped tokens you mint in the dashboard. version: 1.0.0 servers: - url: https://app.trackplay.io/api/v1 description: App API. Conversions, videos, webhooks. - url: https://e.trackplay.io description: Events API. High-volume event ingest. security: - bearerAuth: [] tags: - name: Videos description: Create, read, update, and delete videos, and read workspace metadata. - name: Video settings description: Save a settings draft, publish it live, and read or restore past deploys. - name: Uploads description: >- Upload a source video file in one request or in resumable chunks, and poll its processing status. - name: Captions and chapters description: >- Manage caption tracks, chapter markers, AI-generated segments, and CTA cards on a video. - name: Playlists description: Group videos into a playlist or course, and manage the videos inside it. - name: Webhooks description: Subscribe a URL to TrackPlay lifecycle events and test deliveries. - name: Zapier description: >- The REST-hook endpoints Zapier calls to connect a workspace and manage triggers. - name: Analytics description: Read play, retention, event, and conversion analytics for a video. - name: Exports description: Queue and download bulk analytics exports. - name: Conversions description: Report a sale or a lead, from your own server or from a browser fallback. - name: Events description: Send a custom event tied to a viewer's session. - name: Identity description: Resolve a viewer's identity from the page, with no token required. paths: /videos/{video}/upload/init: post: tags: - Uploads summary: Start a resumable upload description: >- Starts a resumable upload session for one orientation of a video. Send the file in 8 MB chunks with `PATCH /uploads/{upload}`, then finish with `POST /uploads/{upload}/complete`. The session expires 24 hours after it is created. For files under 100 MB, the single-shot upload endpoint is simpler. Requires a token with the `videos:write` scope. operationId: initVideoUpload parameters: - name: video in: path required: true schema: type: integer description: The video's numeric ID. - name: Idempotency-Key in: header required: false schema: type: string description: >- Retry-safe key. The first response for a given key is cached for 24 hours and replayed on a repeat, with `Idempotency-Replayed: true` set. requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/UploadInitRequest' responses: '201': description: The upload session. content: application/json: schema: $ref: '#/components/schemas/UploadInitResponse' '401': description: >- `AUTH_REQUIRED`: no token sent. `INVALID_TOKEN`: the token is invalid, expired, or revoked. content: application/json: schema: $ref: '#/components/schemas/ApiError' '403': description: '`INSUFFICIENT_SCOPE`: the token does not carry `videos:write`.' content: application/json: schema: $ref: '#/components/schemas/ApiError' '404': description: '`VIDEO_NOT_FOUND`: no video with that ID exists in this workspace.' content: application/json: schema: $ref: '#/components/schemas/ApiError' '422': description: >- Validation failed. Check `size` is between 1 and 5,368,709,120 bytes, and `mime_type` is one of the supported video types. content: application/json: schema: $ref: '#/components/schemas/ValidationError' '429': description: Rate limited. 60 requests per minute per token. '507': description: >- `INSUFFICIENT_STORAGE`: the server cannot take a file this size right now. Retry later. content: application/json: schema: $ref: '#/components/schemas/ApiError' components: schemas: UploadInitRequest: type: object required: - filename - size - mime_type properties: filename: type: string maxLength: 255 size: type: integer minimum: 1 maximum: 5368709120 description: >- The file size in bytes. Capped at 5 GB (5,368,709,120 bytes), the same ceiling as the dashboard. mime_type: type: string enum: - video/mp4 - video/quicktime - video/x-m4v - video/x-msvideo - video/webm - video/ogg - video/3gpp - video/x-matroska orientation: type: string enum: - landscape - portrait default: landscape description: Which of the video's two orientation slots this upload fills. UploadInitResponse: type: object properties: upload_id: type: string examples: - tpup_8f2c9a1b3e4d5f607182930a4b5c6d7e chunk_size: type: integer description: >- Bytes to send per `PATCH` chunk (8,388,608, fixed by the server). The last chunk is whatever is left. examples: - 8388608 offset: type: integer description: Bytes received so far. `0` at init. size: type: integer description: The size you declared. expires_at: type: string format: date-time description: The session and its chunks expire after this time. upload_url: type: string format: uri description: Where to `PATCH` chunks. ApiError: type: object description: The error shape the app API returns on a failed read or export. properties: error: type: object properties: code: type: string description: >- A stable error code, e.g. `INSUFFICIENT_SCOPE`, `VIDEO_NOT_FOUND`, `EXPORT_NOT_FOUND`. message: type: string description: What went wrong, in plain English. ValidationError: type: object description: >- Laravel's default validation-failure body. `errors` maps each invalid field to its list of messages. properties: message: type: string examples: - The given data was invalid. errors: type: object additionalProperties: type: array items: type: string securitySchemes: bearerAuth: type: http scheme: bearer description: >- A scoped token minted in **Settings → API tokens**. Send it as `Authorization: Bearer tplt_…` or `X-API-Key: tplt_…`. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.