Yes - Google Drive works on your iPad and iPhone via the Google
Drive app.
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You can delete images from Google drive cloud using the Cloud
Gallery manager which allows you to manage your contents and delete
as well on the Google drive cloud.
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It is very easy to download Google Drive. Simply go the website
for Google Drive and click the download Google Drive button. Then
you will follow all of the prompts to download on your computer. It
should only take a few minutes.
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As far as I know, you cannot change Google Drive's background.
You can only change Chrome and Gmail backgrounds.
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Yes, you can do that. Google calls it "Drive". You can download
it from Google sitea and in use the same way as SkyDrive.