Best way to download movies/shows onto ios?

Been using stremio with real debrid for about half a year now and it has worked really well for streaming. It works perfectly on ios, pc, tv etc. I do feel however that I would like some way to download the media I'm watching, is there any good way to do that? I've seen apps like vidhub and infuse be mentioned, but no idea how to get them working. I'm aware that I can direclty download the torrents, but it's pretty annoying to do, and also can't get subtitles with them. Someone who can help?