I have bt email on my Huaewei P30 pro, the app was playing up and I had to reset my phone to factory settings. I downloaded the back up and now when I open my emails, it shows everything exept the sub folders I created. They show up when I log in on my computer but just not on my phone. They are folders like 'receipts' and 'travel' etc. I have looked under the 'show all folders' and it only shows VIP inbox, Drafts, Outbox and Trash. Can anyone advise me please?
You need to log onto your BT email account via a web browser and check that your emails and folders are all there.
If the folders and their contents are still on the BT servers it sounds like when you re-set up your email app you set it up as a POP3 account.
A POP3 account does not replicate the folders on the server. You would need to set your app up as an IMAP account which does replicate the servers folders.
A quick way of checking would be to send an email to your self. If you have your email set up as an IMAP account the sent email will show up in your sent folder on your computer and the sent folder of your phone.