Android File Transfer is an utility that helps mac users to copy screenshots from Google Nexus 7 tablet to their system. Listed below are steps for transferring screenshots to Mac OS X.
Step 1: Download the Android File Transfer utility and install it on your Mac.
Step 2: Launch the Android File Transfer utility and click the Get started button.
Step 3: This should display the files from Google Nexus 7 tablet which is connected to your Mac.
Step 4: Navigate to the Screenshots folder available under Pictures folder.
Step 5: Now transfer all the required pictures to the Mac system.