What makes a good screen creative
People see a digital screen in passing, often just a few seconds. So: one message, large and readable, with strong contrast. Your name, your offer and where to find you must be clear at a glance. Full text in small type is the most common mistake — less is much more here.
Format, size, length
Which format your creative needs depends on the screen — some are portrait, some landscape. The exact resolutions, allowed file types and the maximum length of a clip are in the creative specs. Do not rely on guessing: preview in the try tool and you immediately see whether anything is cut off.