Create Email Attachment Activity


The Create Email Attachment activity is used to create attachments from byte content that can be consumed by the Send Email activity.


First, the Read File Bytes activity could be used to get the bytes of a data file on the server. The byte content could then be passed to the Create Email Attachment activity, and the Content Type and Filename inputs could be set appropriately for the attachment's data type. The attachment output can then be passed to the Send Email activity to be sent along with an email.




Type: Number[]

The byte content of the attachment.

Bytes are the raw binary values that represent content. A byte array is represented by a list of numbers between 0 and 255.

Providing empty or invalid content will cause an error.

Content Type


Type: "application/json" | "application/octet-stream" | "application/pdf" | "application/xml" | "application/zip" | "image/jpeg" | "image/png" | "text/csv" | "text/html" | "text/plain" | String

The MIME type of the content. Workflow Server supports any MIME type defined in the apache and nginx lists as of 2019-12-04.

If the Content Type input is blank or invalid, the MIME type will be determined from the file extension in the Filename input.

More information about MIME types can be found here.



Type: String

The full name (with the extension) that the file will be saved as when the user downloads it.

A filename that is too long, empty, or has invalid characters, such as slashes or colons, will cause an error.

The following file extensions represent executables and will cause an error as these file types are a security risk to the end user:

  • .app
  • .bat
  • .bin
  • .deb
  • .dmg
  • .elf
  • .exe
  • .jar
  • .js
  • .msi
  • .py
  • .sh



Type: Object

The attachment object. This object should be passed to the Send Email activity.


For information about the ID, Display Name, and Description properties, see Properties Common to all Activities.

Connectivity Requirements

This activity does not work when the device has intermittent connectivity to the network.