Hello, goodfellas 
Regarding the Google Charts elements, the Page to PDF plugin is not able to convert them, unfortunately.
But we have made a major plugin update and added the new plugin element. You can use it for converting HTML charts elements. Also, it is a bit more stable, as for page breaking feature, PDF page scaling, etc.
You can take a look at this test page to see how the new plugin element can be used:zeroqode-demo-01 | Bubble Editor
We will announce this major update soon, so you can test it our right now. Thank you for your patience 
As @gilles has advised you, can you please make sure that you have enabled the “Upload PDF to bubble AWS” checkbox? This checkbox determines whether the PDF file will be saved to the File Manager of your application after conversion.
Regards,
Zeroqode Team