Reading email through NextCloud on Android app

Nextcloud version (eg, 20.0.5): 23.0.0
Operating system and version (eg, Ubuntu 20.04): Docker image on Synology
Apache or nginx version (eg, Apache 2.4.25): 2.4.52
PHP version (eg, 7.4): 8.0.14

The issue you are facing:

I’ve set up NextCloud Mail on my NextCloud server but I can’t see any way to access it on the NextCloud Android App