Note: The endpoint displayed here serves as an example. The endpoint that's retrieved in Step 1 looks similar to this.

Uploading a file consists of the following two parts:

Breaking down your file in parts/chunks. Each part must be at least 5 MB in size, except the last part. There is no size limit on the last part of your multipart upload. For more information, about how amazon handles parts/chunks, visit: Amazon's website.
Sending the chunks over to Amazon and then registering them to Bynder. You can repeat those calls up until your file has been uploaded completely.

Make a POST request to the Amazon upload endpoint you received from calling Get closest AmazonS3 upload endpoint. Use a multipart/form-data to send all of the parameters that the multipart_params of the previous request included; plus the following additional parameters:

Name	Value	Type
'Content-Type'	Content type extracted from the multipart_params's Content-Type of the response of the initialise upload request.	string
'Policy'	Policy extracted from the multipart_params's Policy of the response of the initialise upload request.	string
'X-Amz-Signature'	Signature extracted from the multipart_params's X-Amz-Signature of the response of the initialise upload request.	string
'acl'	Access control list extracted from the multipart_params's acl of the response of the initialise upload request.	string
'key'	Key extracted from the multipart_params's key of the response of the initialise upload request followed by p{Chunk index number}. Example: "pluploads/12345/image.png/p1".	string
'success_action_status'	Success action status extracted from the multipart_params's success_action_status of the response of the initialise upload request.	string
'x-amz-algorithm'	Algorithm extracted from the multipart_params's x-amz-algorithm of the response of the initialise upload request.	string
'x-amz-credential'	Credential extracted from the multipart_params's x-amz-credential of the response of the initialise upload request.	string
'x-amz-date'	Date extracted from the multipart_params's x-amz-date of the response of the initialise upload request.	string
'name'	Filename that was passed as attribute in the initialise upload request.	string
'chunk'	Chunk index number (indexing starts from 1).	number
'chunks'	Total number of chunks.	number
'Filename'	The value of the key from the multipart_params of the response of the initise upload request followed by p{Chunk index number}. Example: "pluploads/12345/image.png/p1". ATTENTION: Filename must start with capital F.	string
'File'	File or chunk of the file to be uploaded.	byte array