I opened a template directly from a ZIP file.

I opened a template directly from a ZIP file. After six hours of work, saving every half hour, I got no error messages, I saved as ODT, DOCX and exported the file to a PDF. I closed Libre and went online to upload my work to KDP. Ubuntu came back with a this file does not exist message. i presume this happened because I oped the original template from a ZIP. Is there any way to recover my work? I’ve tried ls -R | grep ‘.*[.]pdf’ and that can’t find the files.

How does one even open “a template directly from a ZIP file”?

However, your saved .odt file and the exported .pdf should be somewhere on your disk in the folder you saved to … maybe find ~/ -name '*.pdf' helps, but your ls should had listed it as well (provided that you started from a directory that actually is above).