How to add Google reCaptcha Version 2 in User Private Files PRO Login form:

The login form that appears on the [upf_manager] shortcode page and [upf_selected_files] shortcode page when the user is not logged in.

Login into WordPress dashboard as an admin. Navigate to ‘User Private File PRO’ and click on ‘Log in’ tab from top.
Scroll down to Option – ‘Display Google reCAPTCHA v2’ and toggle it ON.

Now you can enter your site Key and secret Key. Click on save.

A google reCaptcha challenge will appear along with login form.

How to Get Google reCaptcha Version 2 Keys from Google:

Open Google reCaptcha Admin Console by visiting this link – https://www.google.com/recaptcha/admin/

Sign in with your google account and admin console will open up.

You will be asked to ‘Register a new site’ if you are using it first time. If you already have some sites there then Click on create (+) to Register a new site.

Label – Give your API Keys a name to remember by.
reCaptcha Type – Select Challenge (v2)
Challenge Type – ANY (“I’m not a robot” Checkbox OR Invisible reCAPTCHA badge)
Domains – add your website URL without www, http or https.

Agree to Google reCaptcha term of service and Click on SUBMIT.

Now you can COPY SITE KEY and COPY SECRET KEY.