There is no specific file format we need to work with. We prefer those formats specially supports on Adobe Photoshop & Illustrator. But we only prefer the formats like JPEG .PSD .TIFF, PNG for Photoshop and .AI .EPS PDF for Illustrator. No matter if you send camera raw files. The camera raw file formats like CR2, DNG are also preferred. We will convert those files using generic Adobe photo editors and then proceed with the images.