Make a 6 m 2*2 m 4 inkjet poster in ps. How to change the pixels when importing the material? Seek expert answers

The material must be at least 75 pixels. You can open it in PS first, adjust the pixels, and then drag it to the window where the poster is made, and adjust the size as required. If the pixels of your material are very small, there is no need to modify it, because it will be particularly blurred after adjustment. If the material is simple, you can make one yourself. In AI, it is a vector, and you can adjust it at will. I hope I can help you!