Using Outlook 365 on ios with Bi 14 and Orbit reader 20 on iphone 7

Hi all,
Does anyone have any tips on using the outlook app on an iphone 7 with orbit reader 20 how do you delete multiple messages at once, how do you add people to the BCC field as can only use the CC field to add one contact.
Also do any Braille uses think that the input cursor jumps more in outlook than in other mail apps when typing on a Braille Display has any of you managed to get round this or reported it to appleat all as it always seems to work when I ring apple.
Any tricks and tips that Braille display users have on using outlook would be greatfully received as got to use it for work and have added my Gmail account