Canon 3200 - trying to do booklet printing, saddle

Are you sure that the original documents fed through properly? If the document feeder double feeds then the machine will think that there is only one document, the first one. If the machine does not through up an error then this may well be the problem. Check with normal copying first. Also remember, you would need at least 5 or more documents to make a booklet as each page has 4 A4 pages reduced to A5.