I'm at https://acrobat.adobe.com and I have been shared a PDF file.

I can't find any way at all to make a copy of said PDF file within the file management interface (the Home page).

The only way I've found to do it is to open the PDF and try to edit it at which point it says that I can't edit it and asks me if I want to make a copy.

There really should be a very simple way to make copies of files in the file management interface.