downloaded file I want to delete
Droid Turbo 2: Go to downloads (It should be in your apps). Press and hold the file to be removed. After two seconds the trash can will pop-up in the upper right. Touch the trash can and the file is deleted.
There is a "download" file under storage in Settings. If you list the files, you can drag your finger to the right and you should see the trash can in the upper right hand corner..tap it and the file is deleted.
Some phones have an app named Downloads. Check it, all your downloaded files are listed there and can be deleted from there.
Or using a File Manager/Explorer app, look for a folder named Downloads.