change the location where attachments (file&note) are stored

The situation is that:
there are two kinds of linking style in my library, one is created when I use the "find PDF",
so it is a folder named by 8 alphabets, the other one is when the PDF is not found, I download the PDF from a website and put it in the storage location, and then link it to the item using "Attach links to file"
Now, I find the storage space is not enough, so I want to move all in the storage location to an external hard drive. How can I do that without messing with the linkages?
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