You can add attachments to your campaigns by using the attachment meta box on the campaign edit screen.

You can add any attachment you can upload to your site with a maximum total size of 1MB.

You can alter the limit by using this filter hook:

add_filter( 'mailster_attachments_max_filesize', function() {
// Return 5MB
return 1024 * 1024 * 5;
} );

Keep in mind that attachments can significantly increase your email size and some hosts may reject your mailings. You should also consider to send a link where subscribers can download your files.

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