A video file I didn't want appeared on my phone and I can't get rid of the file, help. How can I permanently remove the file?

[AC Question]

a video file I didn't want appeared on my phone and I can't get rid of the file, help

I accidentally downloaded a video file to my phone which I didn't want, I was able to delete the video but the file appears in downloads, how can I permimamtly remove the file, I'm using a samsung galaxy s6, thanks