Parameter Value: [Salesforce ID of an object that allows attachments]
Specifies the Salesforce IDs of up to 150 static attachments to be included in a single merge process. Specify multiple attachments by separating the Salesforce IDs with commas.
When you use this parameter, Composer ignores the AttachmentSourceId and SelectAttachments parameters.
Acceptable file types include Excel, PDF, PowerPoint, Salesforce Files, .PNG, .JPG, and Word.
To avoid exceeding URL length limitations, use a Qvar to specify multiple Attachment IDs. Although up to 150 static attachment IDs can be specified, only five appear as selected in the Composer UI Attachments tab.