How can Kazakiri Hyouka appear in a photograph but not be seen in surveillance camera footage? As we know about Kazakiri Hyouka, nobody has seen her and knows about her appearance.In episode 21 at 16:15, Yomikawa tries to confirm the existence of the 2nd outsider with Tsukuyomi Komoe. Later, in episode 22 14:25  Tsukuyomi Komoe states that Hyouka didn't appear on any surveillance cameras in the school, but later, in Game Center, she appears in a photograph taken in the photo booth, with Index. It might be possible because she manifested in the real world when she touched Index. But she should have before after that, while getting leaving the school.

Tsukuyomi Komoe does say that nobody knows how she entered the school, but doesn't talk about how she got out without appearing on camera. But Yomikawa's question does imply that she didn't appear at all.

Yomikawa might have viewed all the footage and looked for info about the outsiders but didn't find anything on Kazakiri Hyouka. 

So why wasn't she seen in the surveillance camera footage after she manifested in the real world?
Well, she's unstable, so her qualities change every once in as while, making it possible that she was observable by a surveillance camera at one point and not another...

Surveillance cameras may also work differently from photographs, making her able to be seen in the latter, even if her qualities were the same.

Lastly, the surveillance cameras are likely monitored by Aleister, especially the ones in That School, and he erased Hyouka's presence because he didn't want her revealed or something, but a photo camera isn't connected, and so he can't hide her presence there.



If your question is "Why didn't Yomikawa find any info on Hyouka?", perhaps its just because there was no information to find. She's totally new. There wouldn't be much, if any information on her generated in less than a day out in public?