If you remake a song using your own samples, but use the vocals over your remake, is it copyrighted?

So i remade the song Feel Good by Illenium & Gryffin ft. Daya, I used my own samples I have gathered over the years from websites etc and VSTs to make

So i remade the song Feel Good by Illenium & Gryffin ft. Daya, I used my own samples I have gathered over the years from websites etc and VSTs to make the song. Except, I downloaded the vocal stems from a website which was doing a remix competition. When I uploaded the playthrough of my FL Studio playlist to YouTube, it got flagged for copyright. Would such a thing actually be considered Copyright infringement?

or:So i remade the song Feel Good by Illenium & Gryffin ft. Daya, I used my own samples I have gathered over the years from websites etc and VSTs to make the song. Except, I downloaded the vocal stems from a website which was doing a remix competition. When I uploaded the playthrough of my FL Studio playlist to YouTube, it got flagged for copyright. Would such a thing actually be considered Copyright infringement?

Tags: