webform token %value[key] doesn't work

I create a multistep webform separated by page break. There are some questions on first page, 2nd page will show a document which include answers of 1st page, if user click Previous Button back to 1st page, they could change answer, then when goes to 2nd page, then the matched info should changed accordingly. Since in this stage, data is not submitted, so I supposed it will store in temperate structure.

After some research, I found the token %value[key] can do it. So I supposed just replace 'key' to any element key created on webform, it should shows value of answer field.

For example, I have a selection field is 'Select your country' in first page, its key is 'region' and answer is 'Australia'. I have a component in Markup type to shows value in 2nd page, then I just simply give the value %value[region] It should shows 'Australia'. Right?

But I just get exactly code shows to screen, like '%value[region]'.

Modules I installed are :

Token-6.x-1.16

Token-actions-6.x-1.16

TokenSTARTER-6.x-1.16

Webform-6.x-3.11

Webform-Conditional-6.x-1.1

They all activated, and permission allowed.

Did I miss something? Any idea will be appreciated.