Gmail
All Gmail folders are empty on iPhone & iPad emails missing. is there any way to restore these.
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If you have checked that your Gmail account passwords are set correctly - and this does not resolve the problem - it may be necessary to remove the account from your device, restart, then re-add the account to the affected device. This usually resolves the problem - and as your email content is saved on Google’s email servers, should restore everything to your device(s).