The articles/KMCreateArticle API now allows up to five file attachments with each article, with a maximum file attachment size of 5MB.

The API also supports the standard file attachment types (.docx, .xlsx, .pptx, and .pdf) and image attachment types (.jpg, .gif, .png, and .svg) that Pega platform supports. You can configure rate limiting (to mitigate denial of service attacks) and specify restricted file types in the authoring portal. A stub or extension is also provided for organizations who want to call a virus scan service.

See Using Pega Knowledge REST APIs in the Pega Knowledge Implementation Guide.