When creating your Template on JustProtect, add the supported column "Require Attachment Condition" as a new column.
In this column, place the condition that, if true, would set a requirement to the question.
In the simplest example of a question "Do you have an information security policy?" with Yes and No as choices, by placing "Yes" (with quotes) in the "Require Attachment Condition" field, the question will require an attachment from the responder when Yes is selected.
This also works for Multiple Choice Single Answers via chaining.
If the question was "How tall is the Empire State Building" and the choices were Small, Medium, and Large, you can require an attachment on Medium and Large with the following condition in "Require Attachment Condition":
"Medium" OR "Large"
An attachment will be required if either Medium or Large is chosen.
The same applies to "and" on Multiple Choice Multiple Answers.
If you ask "What colors are the American Flag?", you can require an attachment on:
"Red" AND "White" AND "Blue"
This will require an attachment if Red, White, and Blue are selected.
Keep in mind, that this would still require an attachment if the Responder chooses Red, Green, White, Purple, and Blue.