Same functionality with other mediatypes

Hi!
Thank you for a great plugin. You have saved me hours of work!

would it be possible to do the same with other file types. I am trying to do the same with pdfs.

I have a wordpress page with 300+ links to external pdfs. I need to grab the external pdfs, save them in my “wp-content->upload” folder and automatically change the links in the post to the new file location.

Example:
Existing post:

<br />
Some text
<a href="https://www.NotMyPage.com/system/script/getfile2.asp?id=752" rel="nofollow">
Download the pdf</a> some more text

New post after the pdf is grabbed, saved and link has changed:

Some text
<a href="https://www.myPage.com/wp-content/uploads/pdfs/filename" rel="nofollow">Download the pdf</a>
some more text

Can you guide me in the right direction, Thank you!

Gimme

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