[Question] How is someone catfishing me? (Snapchat)

[zeek90000]

So we had been talking for about an hour and they sent a few snaps (pics and vids) so I was convinced they were real. I am using an Android and when you use the built in screen record it doesn't send a notification so I used to to record one of "her" snaps. I then screenshotted it out of the video and used two reverse image searching tools to ensure it's validity. Sadly I got 2 results, both of public NSFW sites. How were they able to send these snaps?? No filters and it wasn't a sticker.