Printing an email to PDF file mystery

I'm trying to print an email to a PDF file using CTRL+p and choosing
"Print to File" with output format "PDF". 

I'm pretty certain I've done this before without issue, but this time I
couldn't find the file anywhere, and definitely not in the home
directory where the dialog had proposed to put it by default.

I then tried printing it again and mysteriously, the print dialog said
the file already existed and asked if I wanted to overwrite it. 

I ran a "find /" on my whole system and couldn't find it. 

I'm running Evolution 3.44.4 (by Flathub.org) with flatpak on Linux
Mint Cinnamon. I suspect this has something to do with flatpak because
I had a similar wierdness with Signal flatpak and saving images to
disk. 

Are the files really there? How do I find them? 

Thanks
Adam

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