SteelBrick CPQ generates quote documents in PDF or Word format. A user setting prompts the user for document output format when the user clicks Generate Document.
Before you being using this feature, check your HTML template content records for any embedded images. Add the following to the end of the URL that references these images: "&contentType=xxx" where xxx is replaced by the MIME Type field contents on the document detail page of this image.
This is the URL for an externally available image in the Documents tab:
Because the image as a MIME Type of "image/png", the URL must be changed to: