Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

I am importing a site with almost 4GB of media and almost 10,000 posts and it takes longer than I'd like.

Describe the solution you'd like

Potential solutions:

• Check to see if file exists in wp-content/uploads/ already. If it does, use it instead of fetching it
  • To be fast this would need to be naive (matching only file name) and should probably only be enabled with an option
• As above, but using --source-dir= or similar option
• Allow attachements to be imported with file:// URLs.
  • Currently, file:// URLs result in errors like:

    Failed to import Media “media_name”: Request failed due to an error:
    A valid URL was not provided. (http_request_failed)<br />
    

    • The error remains when the http_request_host_is_external is updated to be __return_true