I received an Airdrop of a pdf file and opened it in Chrome. Now I can't do anything else with it.

I understand that normally with a PDF file in Chrome, you can just tap on it and the "Open with..." prompt will appear at the bottom of the screen. In this case, it's not.

If it helps, the file in the address bar starts with "chrome://external-file".

Is there any way I can get this file out of Chrome? If it matters, it's a pretty huge file, 830 pages.

Thanks in advance for any help.