When using creative dimension filtering, what steps must be taken to generate dynamic previews correctly?

To generate dynamic previews correctly using creative dimension filtering, you must enter one specific creative size at a time. After entering the size, you then select the corresponding creative that matches that dimension. Finally, clicking "Apply" will filter the previews to show only creatives of that exact size. This focused approach ensures accurate preview generation for individual creative dimensions. Entering comma-separated values or selecting multiple sizes simultaneously would not allow for the precise filtering needed to preview specific creative dimensions effectively. Simply entering a size without selecting the creative, or selecting all sizes, would also fail to achieve the desired granular preview.