Cannot process the Photo Book; it fails always at the very last stage with "error occurred while uploading on of your files. Pls check your network connection and click Retry..." Tried at 12 times and no joy! Can anyone help?

Can anyone help with the Photo Book process? I have tried at least a dozen times and the Photo Book always fails at the very last stage of the process. I ordered Buy Book, it assembles the book and files are transferred until the very last moment... it says " An error occurred while uoloading one of your files. Please check your network connection and click Retry to resend your files." It fails every time, any advice? My server is TalkTalk which may explain everything !! ?? Help.