Uploading a file from PhotoGallery to Flash Drive

Thank you for prompt reply to my first question.  It was correct info and all went well.        I need to transfer pictures from one folder out of Photo Gallery to a Flash Drive so I can continue to add pics (flowers for instance) as they are taken at different times.  I successfully selected and transferred to another folder, the pictures.   It seems that the only thing I can do is to make a CD or a DVD.  It doesn't seem to give me an option of just transferring the folder, after selecting all of the photos in that folder, to a Flash Drive or SD Card.  Everything is "backed up" but I don't want "everything" on this Flash Drive or SD Card . . .just selected folder.