There are few ways to get logs from your iPhone on Windows. One option we'll describe is by using Windows app called iTools. Download it here
Also connect your device via USB so the app will be able to detect it.
- Open the iTools App
- Open ToolBox
- See Below - Advanced Features - Real-Time Log
Once you open real-time Log you will see what's happening in your device in Real-time, however, make sure you are ready to reproduce the bug before you do it.
NB! When you are ready to save the file, always do so in .txt format.