content

The message content. Note the following restrictions:

• You can include up to 20 images. Each image's size, height, and width must be no more than 3.75 MB, 8000 px, and 8000 px, respectively.

• You can include up to five documents. Each document's size must be no more than 4.5 MB.

• If you include a ContentBlock with a document field in the array, you must also include a ContentBlock with a text field.

• You can only include images and documents if the role is user.