I'm on the Samsung Galaxy Tab S2, model SM-T715Y, running Android version 7.71.1-release.15,
trying to follow the instructions of
https://help.twitter.com/en/managing-your-account/managing-multiple-twitter-accounts
to add a new account to my Twitter application.
However, I can not find the option "Add existing account" as described.
The top menu shows:
"Share", "Drafts", "View lists", "See moments", "QR Code"
but no accounts. There is no "down arrow" icon.
The profile menu shows:
"Profile", "Lists", "Bookmarks", "Moments", "Twitter Ads", "Settings and Privacy", "Help Center".
By clicking on "Settings and privacy" is displayed below my account:
"Account", "Privacy and security", "Notifications", "Content preferences"
and under "General":
"Screen and sound", "Data usage", "Accessibility", "Proxy", "About Twitter".
I do not see where else I could find that option.