BSA Conundrum: What's the Real-Deal on the 'Best Evidence' Rule?

Hey CLAT PG aspirants, I need your help. I'm stuck on this 'best evidence' rule in BSA (Evidence Act). Textbooks explain it in a way that makes my head spin. According to them, the best evidence rule is all about producing the most reliable and original piece of evidence in a case. But what does that even mean in the real world? Let's say I'm a witness to a road accident, and I have a video recording of the incident on my phone, but the original footage has been deleted. Can I still use the still images from my phone as evidence? Or do I need to recreate the video? What's the most authentic way to present evidence in such a situation? Help me decipher this mystery, friends!