Override vendor/magento/module-customer PHTML file

Question

Magento 2.2.

I have a theme:

/app/design/frontend/Companyname/Newtheme/

I would like to override this PHTML file:

/vendor/magento/module-customer/view/frontend/templates/account/authentication-popup.phtml

What is the correct directory structure in my theme's folder to put my new file?

I have tried:

/app/design/frontend/Companyname/Newtheme/Magento_Customer/view/frontend/templates/account/authentication-popup.phtml

and

/app/design/frontend/Companyname/Newtheme/Magento_Theme/view/frontend/templates/account/authentication-popup.phtml

and

/app/design/frontend/Companyname/Newtheme/Magento_Theme/templates/account/authentication-popup.phtml

p.s. I know this is a really basic question, I am just not understanding the documentation and many examples online. Not sure why.

Answer 1

Correct Folder path.. You have mention 2 times frontend...

app/design/frontend/Companyname/Newtheme/Magento_Customer/templates/account/authentication-popup.phtml

Don't forget to run

setup:static-content:deploy
cache:flush

Answer 2

It must be.

/app/design/frontend/Companyname/Newtheme/Magento_Customer/templates/account/authentication-popup.phtml

No need to add view/frontend to your custom theme.