The attachment reminder looks for the word attachment (and other words like file types) in the body of your message and reminds you to add an attachment before hitting send.
Ri Runatab'al taqoj nukanoj rik'in ri rutzij taqoj (chuqa' ch'aqa' chik taq tzij achi'el kiwäch taq yakb'äl) pa ruch'akulal ri rutzijol ataqoj chuqa' nunataj chawe chi tatz'aqatisaj el jun taqoj chuwäch natäq el.