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To upload a new version of a file to Box via direct upload, make an API call to
the POST /files/:id/content API with the content of the file, the
desired file name, and the folder ID.
To prevent wasting time and bandwidth uploading a file that is going to be rejected it is recommended to perform a pre-flight check before uploading the file.
The request body of this API uses a content type of multipart/form-data. This
is used to transmit two parts, namely the file attributes and the file's actual
content.
The first part is called attributes and contains a JSON object with
information about the file, including the name of the file and the id of the
parent folder.
The following is an example a test.txt being uploaded to the root folder of
the user.
POST /api/2.0/files/123/content HTTP/1.1
Host: upload.box.com
Authorization: Bearer [ACCESS_TOKEN]
content-length: 343
content-type: multipart/form-data; boundary=------------------------9fd09388d840fef1
--------------------------9fd09388d840fef1
content-disposition: form-data; name="attributes"
{"name":"test.txt", "parent":{"id":"0"}}
--------------------------9fd09388d840fef1
content-disposition: form-data; name="file"; filename="test.txt"
content-type: text/plain
Test file text.
--------------------------9fd09388d840fef1--To learn more about all the parameters available when uploading files, head over
to the reference documentation for this API call. These parameters
include a content-md5 that can be set to ensure a file is not corrupted in
transit, and the ability to explicitly specify the file creation time at a
different time than the upload time.
For file versions an additional if-match header can be passed
along to prevent overwriting a file that has already been updated since the
application last inspected the content.
Direct uploads are limited to a maximum file size of 50MB. For larger files, please use the chunked upload APIs.
Upload limits are dictated by the type of account of the authenticated user. More information can be found in our community article on this topic.