How to attach a file from zoho workdrive when i send and email

How to attach a file from zoho workdrive when i send and email

hi i have a question how can i attach a file when i send an email this is my code 
i made an invoke url but doesn´t work or doesnt attach the file that i have on workdrive
thanks

etiqueta = invokeUrl
[
url: "https://workdrive.zohoexternal.com/external/52nKCovLv7b-LNLhw"
type: GET

]; 
sendmail
[
from :zoho.adminuserid
to :input.correo_electr_nico
subject :"tus folios de certificados de la solicitud número " + input.Numero_de_solicitud + " han sido asignados"
message :"<div></p></div>"
Attachments :template:Solicitud_de_Certificado as PDF
Attachments :file:etiqueta
]


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