I was under the impression that documents stored under /Downloads/ or elsewhere in the file-system (when using dev-mode) are not uploaded to the "cloud".
I would not assume that all information voluntarily disclosed
to some member of the public for a limited purpose is,
for that reason alone, disentitled to Fourth Amendment protection.
[citations omitted]
Resolution of these difficult questions in this case is unnecessary,
however, because the Government's physical intrusion on Jones' Jeep
supplies a narrower basis for decision.
http://www.supremecourt.gov/opinions/11pdf/10-1259.pdf