Trying to import RAW files (from Canon 5D Mark III) but I'm receiving the following error message "some import operations were not performed". I am trying to copy to my Seagate backup drive, however the only destination it will let me copy to is my Lexar flash drive (where I don't want to store them!). I've checked all the file permissions--everything says "read and write". Not sure where to start I recently switched to an iMac where the problems started (never any issues importing into Lightroom on my PC--just slowness). Please help!