getFileFromURL.ts

const getFileFromURL = async (url: string): Promise<File> => {
  const result = await fetch(url)
  const buffer = await result.arrayBuffer()
  const blob = new Blob([buffer])
  const file = new File([blob], url.split('/')[1])
  return file
}

// Usage
const someFile: File
const fileURL = URL.createObjectURL(someFile)
const newFile = getFileFromURL(fileURL)