Send IFTTT an email at trigger@applet.ifttt.com with a hashtag in the subject (e.g. #IFTTT) and this Trigger fires. You can optionally add a single file attachment (up to 30MB) and IFTTT will create a public URL to the file as an Ingredient.
This Action will append a to-do checkbox to a note as determined by its title and notebook. Once a note’s size reaches 2MB a new note will be created.