If the dimensions of your poster are too large and Photoshop doesn’t allow you to save it as PDF, you can change the resolution to 200 dpi and try saving it again (the quality of your print will still be great since it’s a PDF file). If your file contains multiple smaller posters and you are planning to cut them out after printing, consider splitting your file into smaller pieces If none of the above works, contact us for alternative solutions like uploading a different format