Error: The file has properties that can't be copied to the new location

Hi. I am getting the same message. I have Lenovo Yoga 700 which has only 200Gb storage so am using 256Gb SDXC Sandisk to supplement and am transferring over all of my Dropbox folder to the card. It comes up with same error message for loads of files so I ended up clicking ‘yes to all’. Bearing in mind we are talking about all sorts of files (spreadsheets, pictures etc) it is still the case that the files will not be missing any of the origianal information? Thanks.