iPhone users can start associating files from Drive directly to Google Calendar events, thanks to the app playing catch up to its Android version. Those files can be documents, PDFs, work presentations and spreadsheets or photos you took at a party — whatever they are, Calendar will ask whether you want other people to be able to view or edit them. Just like the Android update that rolled out a few months ago, this one also comes with a seven-day week view so users can easily peek at their schedules.
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https://www.engadget.com/2015/06/24/google-calendar-iphone-drive-files/