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How to make downloads as file.pdf format, not as cdn123456789_file.pdf format

How do you make click to download .png, .doc, and .pdf with native filename format without CDN name?

Example:
“Click here to download (pdf)”
5b61560c6d61a0848e9d8359/5bbf88f99fc0b61811528251_Book_Press-Release_11-16-19.pdf


She needs it in this format when click to download

Host the files externally.