I am very new to this, so I apologize if this has been covered elsewhere (though I did plenty of searching before posting). I am attempting to post a workbook to a project using a REST call via cURL but am having trouble understanding the requirements of the command. I have numerous other GET/POST/PUT calls that work perfectly well, but I do not know how to format the command for a "multipart/mixed" request that's required for this.
Has anyone else used the cURL command-line for such a purpose? If so would you mind sharing how it should be setup?