Update troubleshooting.md

Author: prigiattiperrut

src/connections/sources/catalog/libraries/website/javascript/troubleshooting.md

@@ -20,16 +20,26 @@ Segment also provides a Chrome web extension, [Segment Inspector](/docs/connecti
 
 Solution: [Follow the Analytics.js Quickstart Guide](/docs/connections/sources/catalog/libraries/website/javascript/quickstart/)
 
-## Are you loading two instances of Analytics.js?
+## Loading Multiple Instances of Analytics.js
 
-Note that you *cannot* load Analytics.js twice on the same page, even if you're using different write keys. You might encounter `Uncaught RangeError: Maximum call stack size exceeded`. You can conditionally set the write key based on an environment variable.
+### Analytics.js Snippet Loaded More Than Once
+
+It is not possible to load the Analytics.js snippet twice on the same page, even if different write keys are used. Doing so often results in errors like `Uncaught RangeError: Maximum call stack size exceeded`. However, you can conditionally set the write key based on an environment variable:
 
 Example:
 ```js
 var writeKey;
 ENV === 'production' ? writeKey = 'A' : writeKey = 'B';
 ```
 
+### Multiple Versions of Analytics.js
+
+It is possible to load multiple versions of Analytics.js, such as a snippet version and an npm version (with different writekeys), in the same environment without them interfering with each other. This allows the npm library and the browser snippet to coexist without conflicting.Just keep in mind the following limitations with this approach:
+
+**1. Device-Mode Destination Conflicts**: If you are using the same device-mode destination in both instances (i.e., across different writekeys), conflicts may occur. This is due to third-party scripts that don't support global instances. To avoid issues, ensure you are not using the same device-mode destination between different write keys.
+
+**2. CDN URL Customization:** We currently do not support overriding the CDNURL when using multiple instances of Analytics.js.
+
 ## Do you see events appear in your debugger?
 
 When you reload the page, does your debugger show a new [`page`](/docs/connections/spec/page)? You can also check the JavaScript console in the browser and manually fire an event, like an Identify call, which would show up in the debugger.