https://helpx.adobe.com/lightroom/faq.html Quote- "Lightroom Classic CC supports most native camera raw file formats in
addition to PNG, DNG, TIFF, and JPEG formats. In other words, it
supports the formats primarily used in digital cameras. Lightroom
Classic CC also supports the PSD file format for enhanced integration
with Photoshop. For a complete list of raw format support by camera make
and model, see the Camera Raw page." Manipulating JPG files is no problem.