I have just offloaded more than 700 files (images, video, audio, and pdf) to my Publitio account. The files were uploaded to the root folder and then I created several folders in Publitio’s Media Library to enable me to manage my assets better. All those images on my site, which have been moved to folders, are now replaced by a black background, on which is displayed "the file ‘…….jpg’ does’nt exist." How can I resolve this issue without moving back hundreds of files to the root folder, thus making my media files cumbersome to manage?