Can google see my files when I create Google docs?

Hi dropbox,

i notice the article https://help.dropbox.com/integrations/create-google-docs tells me that Any Google Docs, Sheets, and Slides created in Dropbox save to your Dropbox account and count toward your storage space. Changes made to these Google Docs, Sheets, and Slides automatically save back to your Dropbox account. They do not save back to your Google Drive or Google account in any way.

 

but when I open my file with google sheet, the contents are retrived from url like https://docs.google.com/spreadsheets/d/XXXXXXXXXXXXXXXX.

does that means google can see my files?

 

thank,

royan