What is file compression?
Compressing a file means reducing the size of the file so that it takes up less space. When a PDF file is very large, it can make sharing the document more difficult, in which case compression can offer a solution. There are several tools available online that can compress PDF files.
Sharing a large file
In the order form, it is possible to upload files up to a size of 500 MB. Is your file larger (even after compression)? Then you can, for example, use WeTransfer or Dropbox to deliver your files.