files.completeUploadExternal method
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Usage info
This method finalizes a file upload started with files.getUploadURLExternal.
After uploading the file to the URL obtained from files.getUploadURLExternal, call this endpoint to share the uploaded file in Slack. In most cases, callers will supply a channel where the file will be shared. If the channel_id is not specified, the file will remain private.
If this method is not called, the uploaded file and associated metadata will be discarded.
This method can only be called once.