Create a FileShare Link and select the Access & Permissions tab.
Here you will have a drop down menu for the type of Password Security you would like to use.
None- No Password Security on link and password field can be left blank.
Password - Type in the word, phrase, or string of characters
Here is a look at what the Password option looks like:
OTP-Email - One Time Password gets sent to the email entered from the link
Here is a look at how the OTP - Email looks:
Input Email address to receive One-Time Password
Once email has been entered click Get OTP and then check email entered for One-Time Password, copy and paste or re-enter into OTP field.
Here is how the OTP - Email looks:
There is a fourth option OTP - SMS but it must be enable by following the steps in this link
and then finish customizing the link or send it.