Hi Rich! You don't transfer the MP3 files. But instead, you transfer the OPF file from the magazine issue folder. When you send the OPF file to bookport, the dialogue will open allowing you to specify the range of the magazine you want to transfer, depending on the amount of space available. Just tab through the dialogue and select the range you want, ending with the send button. Your computer will then begin to beep as the book information is compiled and then the file is sent to the bookport. Eventually, you will notice the beeps are rising in pitch. That is letting you know that the file is being sent, and the entire process may take several minutes. When you have transferred the magazine through this process, all navigation features will work well for you. Cheers, Dave