Getting error in downloading images

I am making a Wallpaper App and getting images from airtable and in screen 2 when i click any wallpaper its open larger in screen 3 but using downloader i cant able to download them

Show your error.

error not showing on screen but the download button not working

Is it enabled, as sometimes i too have disabled buttons by mistake and was put in worry that why my code isn’t working even my logic is correct

@tom1010 Use this you can download any file with this