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You need an app that can unzip files. I personally use GoodReader or Workflow as appropriate - but I'm 99.9% sure Readdle's Document app can do this.

Yip, it can. Used Goodreader and Documents (Readdle), and both work well. Haven't had a need to go the Worklow route, but no doubt it would work equally as well.
 
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An easy way is to use the app Workflow as above.

With workflow you can make an easy UnZip-action so that you can "click" on the zip-file in the mail and then push the "send to"-icon and choose Workflow-UnZip. The zip-file then gets unzipped into any location you like.
 
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