When generating screenshots, you can select one or more devices per site, making it easy to generate a range of screenshots for a given ad+site combo.

You can also set a default device, which will pre-fill the device to your selection. Just use the dropdown at the top of the form to pick a device:

Use this option to easily pick a device based on the ad size. For example, a 320x50 ad will be run on mobile.

When using smart device selection, we use the following to map ad sizes to devices:

For ad sizes matching multiple device types, we'll randomly select an eligible device to use. For ad sizes not included in the list above, we'll default to using desktop.