Creates a new media upload document. This includes a temporary upload policy to allow a file upload through a POST request.

Media uploads

Media uploads require a mutli-part POST request to the URL in the meta.upload.url property in the response object:

• The request must include as standard form keys the key-value pairs located in the meta.upload.fields property.
• The request must include the file as the last key under the name file.

Blocked extensions

The following file name extensions are blocked and cannot be used as attachments:

• .bin
• .bat
• .chm
• .com
• .cpl
• .crt
• .exe
• .hlp
• .hta
• .inf
• .ins
• .isp
• .jse
• .lnk
• .mdb
• .msc
• .msi
• .msp
• .mst
• .pcd
• .pif
• .ps1
• .reg
• .scr
• .sct
• .shs
• .vbe
• .vba
• .vbs
• .wsf
• .wsh
• .wsl