Printing

發票logo比例是多少，有像素規定嗎 ?

The aspect ratio is 5:1 and the image file size is 2mb.

產品照片上傳比例

產品照片上傳比例是多少？

16:9

Is there any limit to how many printers I can connect?

No, you are free to use as many printers as you like.