Files should be named in the same order as they will be in the printed product.
Example:
firstname_lastname_cover_file1.pdf
firstname_lastname_file2.pdf
firstname_lastname_file3.pdf
jne.
Number in the file name indicates where to place the material in the final print product.
Please note that total file size limit is 128M, maximum size per one file is 64M and maximum number of files is 10 pcs.