iOS AR app saves camera feed resulting in huge files!

[Loeizd]

Hello, I have a rather simple AR app (detecting an tracked image) and showing 3D models on top.

When I use the app, the camera is recorded every frame and saved to the ipad, I have no idea why. I have nothing recording the screen. At no point have I wanted to record the camera.

The recorded images are without my 3D models or my UI, just the ipad camera, at ipad screen resolution.

The recorded files are in “Documents and Data” of my app.

This results in the iPad being full in about half an hour. Needless to say it is extremely annoying.
This happens in shipping as well as in dev or launching the app from the editor.

UE 4.24, latest mac os, latest iPad mini, no C++.
Edit: it’s doing the same thing with a 4.25 fresh install.

Here’s a shot on my mac of the extracted data from the ipad:

[Loeizd]

I didn’t find why it’s doing that, but I recompiled the ARKitPlugin (not the engine) and commented out the “WriteCameraImageToDisk” function that was writing the images.

Why is it here in the first place? No idea.
Who/what calls this function? No idea.

It works fine now, and no screenshots every frame.
I’m interested to know still for the sake of learning.