FFileHelper::LoadFileToString sometimes works, sometimes doesn't on Oculus Quest

Sometimes the string is empty and sometimes it loads it correctly. I can’t see any errors on the Quest or in the UE4 logs.

    FString path = "/sdcard/test/test.json";
	FString JsonString;
	FFileHelper::LoadFileToString(JsonString, *path);

This was just user error. The file was being emptied accidentally.