Is comodo uploading .pdf as default?

Lately i found:

When you disable “cloud”, disable sandbox,
and use a .pdf from an usb stick (external drive),
you get a question window: “unknown program”.
The checkbox for “submit file for analysis” is pre checked in this question window.

Well, as it is prechecked, i wonder, if we enable “cloud” and/or sandbox, will any .pdf be submitted to comodo without consent?

And anyway, as each .pdf (that wasnt uploaded before) will be “unknown”, what sense does submitting of .pdf files make?
If you would ask the people if they agree to upload any .pdf file, do you think they would?

PDF files are not uploaded to the Comodo cloud servers.