add notes.

docs/troubleshooting.md

@@ -10,6 +10,9 @@
     - [Why `Use an old adapter for compatibility` is somehow enabled in my vault?](#why-use-an-old-adapter-for-compatibility-is-somehow-enabled-in-my-vault)
     - [ZIP (or any extensions) files were not synchronised. Why?](#zip-or-any-extensions-files-were-not-synchronised-why)
     - [I hope to report the issue, but you said you needs `Report`. How to make it?](#i-hope-to-report-the-issue-but-you-said-you-needs-report-how-to-make-it)
+    - [Where can I check the log?](#where-can-i-check-the-log)
+    - [Why are the logs volatile and ephemeral?](#why-are-the-logs-volatile-and-ephemeral)
+    - [Some network logs are not written into the file.](#some-network-logs-are-not-written-into-the-file)
     - [If a file were deleted or trimmed, the capacity of the database should be reduced, right?](#if-a-file-were-deleted-or-trimmed-the-capacity-of-the-database-should-be-reduced-right)
   - [Troubleshooting](#troubleshooting)
     - [On the mobile device, cannot synchronise on the local network!](#on-the-mobile-device-cannot-synchronise-on-the-local-network)
@@ -58,6 +61,24 @@ It depends on Obsidian detects. May toggling `Detect all extensions` of `File an
 We can copy the report to the clipboard, by pressing the `Make report` button on the `Hatch` pane.
 ![Screenshot](../images/hatch.png)
 
+### Where can I check the log?
+We can launch the log pane by `Show log` on the command palette.
+And if you have troubled something, please enable the `Verbose Log` on the `General Setting` pane.
+
+However, the logs would not be kept so long and cleared when restarted. If you want to check the logs, please enable `Write logs into the file` temporarily.
+
+![ScreenShot](../images/write_logs_into_the_file.png)
+
+> [!IMPORTANT]
+> - Writing logs into the file will impact the performance.
+> - Please make sure that you have erased all your confidential information before reporting issue.
+
+### Why are the logs volatile and ephemeral?
+To avoid unexpected exposure to our confidential things.
+
+### Some network logs are not written into the file.
+Especially the CORS error will be reported as a general error to the plug-in for security reasons. So we cannot detect and log it.
+
 ### If a file were deleted or trimmed, the capacity of the database should be reduced, right?
 No, even though if files were deleted, chunks were not deleted.
 Self-hosted LiveSync splits the files into multiple chunks and transfers only newly created. This behaviour enables us to less traffic. And, the chunks will be shared between the files to reduce the total usage of the database.