The error message "The file xxx is too large for the target file system" could indicate that the file system on the USB stick has a maximum file size that you have exceeded. Some file systems, such as FAT32, have a maximum file size of around 4 GB. If your USB stick is formatted with FAT32, this could be the reason. You could reformat the stick to a file system such as exFAT, which supports larger files. Note that all data on the stick will be deleted when you reformat it.