Delete device Files(apk) with Extension "Taifun Files1"

I want delete apk file on my phone (Android 7.0), after downloading it. I tried with Taiphun Files1 Extension: Block “Exist” = true, Block “Get Url” = “file:///Download/ … apk” , but Delete-file = no results. It seems Android permission is include in the extension block. I d’nt understand why it does not work. There is something I don’t do well ?
Thank you for yours ideas and have a good day.

Go through here, and try with the blocks as suggested in that page. You will be succeed

How about reading the extension description: