Lightroom is a popular photo editor for Windows and Mac. It’s free to use, and you can import photos into it using the File > Import menu. However, some photos may not be imported correctly. The most common reason why photos don’t show up in Lightroom is because they’re not properly formatted. Photos can be in JPEG, PNG, or TIFF format. JPEG format is the most common format used by Lightroom, and it’s the most popular format for photos exported to social media platforms like Facebook and Twitter. However, some photos may be in this format but have been incorrectly converted to another format by Lightroom. PNG is a more advancedformat than JPEG and can be used for images that are larger than 2GB. It’s also more versatile because it can be used to create graphics or illustrations. However, some photos may still be in PNG format but have been incorrectly converted to JPEG by Lightroom. TIFF is a newerformat that was created by Adobe Systems Incorporated and has become more popular over the years because it can hold up to 8GB of data per image and it’s easier to convert between formats than JPEG or PNG. However, some photos may still be in TIFF format but have been incorrectly converted to another format by Lightroom.