You can directly include all recipients of an email in your answer, 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 are now likewise addressed.
Open an email.
A menu appears at the screen edge.
Tap the ⋮ symbol and then tap Reply all.
The "Write email” screen opens, recipients are automatically entered.
Add additional recipients if required and write the email as usual.
You decide whether you want to integrate the original email into your email as quoted text.