Does Google Drive sync edited back to the cloud?

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http://www.mobileread.com – Hello, I am doing some experiments with Google Drive on a Nexus 7. My idea would be to use it to read PDF documents, annotate and highlight them and sync them back into the cloud. I tried the following step with both EzPDF and Adobe Reader for Android: 1) Download the pdf file for offline visualization on the tablet; 2) Open the file with both reader from Google Drive; 3) Edit the pdf file with the pdf reader; 4) Close the pdf file; 5) Reopen the pdf file on the tablet and -> my edits are still there. 6) Open the same file from my Google Drive folder on my computer (after waiting for it f (HowTos)