Feng 投放了一个新广告推广活动。他发现广告的图片在移动端被裁剪。日后，他应使用哪种工具来避免这种情况？

The Preview Tool allows advertisers to see how their ad creative will appear across different placements and devices, including mobile. This enables Feng to identify and correct any cropping issues with his ad images before launching the campaign, ensuring optimal display. The other options are not standard LinkedIn Ads tools for this purpose: "尺寸工具" (sizing tool) and "图片工具" (image tool) are generic terms and not specific LinkedIn features, while "格式工具" (formatting tool) typically refers to text formatting, not image display across devices.