Today - editing update - Reverse

Hello. So today I've been continuing to edit. I have got to the stage now that I need to reverse the video to fill the final 2 choruses. The basic idea works on single video files but I cannot apply the effect to multiple files. The easiest way I have found to make this possible is to export the multiple files in one video and then re-import it and add the effect. Unfortunately I will lose quality but it will work in the end.