Android - Bugreport location
Bugreports are stored in /data/data/com.android.shell/files/bugreports
.
You can't access the file directly without root access.
You can connect your device to your PC, and use android SDK tools adb, then go to the directory and in your command line use adb shell bugreport > bugreport.txt
Your bugreport will output.
In my case, they are in /data/user_de/0/com.android.shell/files/bugreports/