Here’s a review of Harry Potter y la piedra filosofal (the Spanish-dubbed or original version with subtitles, as you asked for “subtitulada”).
"Descubre la magia de Harry Potter y la piedra filosofal subtitulada" harry potter y la y la piedra filosofal subtitulada
If you do not have a streaming subscription, you can sometimes find clips or official uploads on YouTube. Here’s a review of Harry Potter y la