You can include all recipients of an email directly in your reply, not just the original sender.
You can now write your email as usual. All recipients of the original email from the To and Cc fields will now also receive
Open the email you want to reply to.
Tap the arrow symbol in the menu bar.
A selection menu appears.
In the selection menu, tap Reply all.
This will open the window to write an email. The recipients will be entered automatically.