How to access emails while offline

hi, i've gmail account synced via imap on iphone , ipad , can't figure out how full download emails, of last month instance, using default mail app.

 

one way go gmail account directly, , set forward emails icloud email. after that, can them please; they'll backed in icloud.

 

Forums iPhone, iPad, and iPod Touch iOS Older iOS Versions iOS 5 and earlier

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