files in the Helper Query don't get updated

[Jeanxyz]

I'm loading files from a folder, Power Query automatically generates a helper query. 

I want the helper query to use a new file I added to the folder recently as my sample file, however, the Power Query doesn't show the new file  even if I click "Refresh Preview" button. 

How can I make the new file appear so that I can change the sample file reference?

[v-binbinyu-msft]

Hi @Jeanxyz ,

I'm a little confused about your needs, Could you please explain them further?

Thanks for your efforts & time in advance.

Best regards,
Community Support Team_Binbin Yu