Header and media

Header types

Type	What it shows	Requirements
None	Nothing
Text	A short line above the body	Up to 60 characters. At most one `{{1}}` variable, and that variable needs a Sample
Image	A picture above the body	JPEG or PNG file
Video	A video above the body	MP4 file
Document	A file attached to the message	PDF file

For Image, Video, and Document the dialog shows File with the name or “No file chosen” and a Choose file button. The file picker filters to the accepted type. A header file is required for these types, and the dialog reports “Header file is required.” until you choose one.

Text header rules

Message	Cause
Header text is required.	The type is Text and the field is empty
Header text is at most 60 characters.	Too long. Meta also limits header text to 60 characters
Header text can contain one `{{1}}`.	You used a second variable, a named variable, or a malformed token
Header variable needs a sample.	The header holds `{{1}}` and the Sample is empty

Meta’s rule is the same: header text supports one parameter, and a header with a parameter needs an example value. See Meta: template components.

What happens to a media file

When you select Create, Kylo uploads the file to storage, then uploads it to Meta through Meta’s resumable upload to get an asset handle, and submits the template with that handle. Meta reviews the sample media as part of template review. See Meta: template fundamentals. If the upload fails, Kylo shows “The header file could not be uploaded.” with Meta’s reason.

You cannot edit a template that has an image, video, or document header. To change the file, create a new template with a new name.

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Header and media

Header types

Text header rules

What happens to a media file

Buttons

​Header types

​Text header rules

​What happens to a media file

Buttons

Header types

Text header rules

What happens to a media file