POST media/upload (APPEND)

POST media/upload (APPEND)


The APPEND command is used to upload a chunk (consecutive byte range) of the media file. For example, a 3 MB file could be split into 3 chunks of size 1 MB, and uploaded using 3 APPEND command requests. After the entire file is uploaded, the next step is to call the FINALIZE command.

There are a number of advantages of uploading a media file in small chunks:

  • Improved reliability and success rates under low bandwidth network conditions
  • Uploads can be paused and resumed
  • File chunks can be retried individually
  • Ability to tune chunk sizes to match changing network conditions e.g on cellular clients


Requests should be multipart/form-data POST format.

Note: The domain for this endpoint is


A successful response returns HTTP 2xx.

Resource URL

Resource Information

Response formats JSON
Requires authentication? Yes (user context only)
Rate limited? Yes


Name Required Description Default Value Example
command required Must be set to APPEND (case sensitive).
media_id required The media_id returned from the INIT command.
media required The raw binary file content being uploaded. It must be <= 5 MB, and cannot be used with media_data.
media_data required The base64-encoded chunk of media file. It must be <= 5 MB and cannot be used with media. Use raw binary (media parameter) when possible.
segment_index required An ordered index of file chunk. It must be between 0-999 inclusive. The first segment has index 0, second segment has index 1, and so on.

Example Request


Example Result

// Successful response returns HTTP 2XX code without any content body.