Web view challenges

Hi people where have i made the mistake when i test the App to download, it will download one file and when you try to download another file after downloading and you tap to play it brings this message “cant open this file” help me if i made any mistake with blocks.Thanks

thanks for your reply, though i dont no yet how to rectify, can help me show me what i should

Which data you set for global list?
i think instead of lable1 text u used lable visible block