http://protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion/support/android-permissions
To do this, tap the menu (hamburger) icon on the top left of the screen and go to Contacts → More (the 3-dot icon on the top right of the screen) → Upload Contacts . (new window) These contacts will be shown under Device Contacts , below your Proton Mail Contacts . If you want to move them to your Proton Mail account, select them → More → Upload to Proton Mail .