Then click on the Gear icon present on the top right (next to the send button).

Don’t leave it blank, as it might show the real password. On the option saying ‘custom error text,’ enter the message like ‘wrong password, try agin’.On the right of the ‘contain option, enter the password.Then leave the ‘contain’ option as it is.Click on the dropdown where it says ‘number’ and select ‘text.’.Next to the required option, click on the three-dot icon and go to ‘response validation.’.And make it mandatory to enter by enabling the required option on the bottom right.Set the ‘short-answer’ option on the right side of the password option.Add ‘Enter Password’ where it says ‘untitled question.’.Add a description on the label ‘form description.’.Name the form by editing the ‘Untitled form.’.Click on the plus sign in order to start a new form.Make the setting to ‘Anyone with the link can view.’.Right-click on the folder you desire to share and get its link.Then create a form that will ask for a password before revealing the folder link. To do this, get the link to share the folder. This way, you will have secured control over what you share. You can share a link to a folder on the drive and then set a password on it.

This method allows you to have control over the stuff you share with google drive. Now your folder is password-protected, so you can upload it to google drive.

Dropbox password protected link