For example, if you directly put it in the C drive, it will be the root directory. If there are other folders in the C drive, it will not be the root directory if you put it in other folders in the C drive (the directory you will see when you click on the memory card is the memory If you continue to click on the files and folders in the root directory of the card, these folders will become the secondary directory and not the root directory. The same is true for mobile phone storage)
The jy folder has no meaning if it is required by some special apps or mobile phones. If so, just create a new folder and name it jy as needed