Follow these steps if you want to export the browser log:
When you run into the strange behavior Press F12 → Go to Console tab then reload and perform the same exact steps which led to the error/warning.
Right-click in the console panel and select Save as (for Chrome, Edge) and Export visible messages to → File (for Firefox)
Navigate to and save the content of the browser log to a file.
Further browser logs analysis
To check for failed requests you can again open the browser console (by pressing F12) and navigate to the Network tab. Make sure you do that before you do the action that fails. Then do the steps to reproduce the problem, once it is done you should see requests in the Network tab. If there are any failed requests you can export them as HAR files. It could be done by selecting the failed request and clicking on “Save all as HAR with content”. Even if there are no failed requests, it will be helpful to export all requests so we can check them out. We will use the HAR file only for troubleshooting purposes.
It is advisable that you clear sensitive data (if there is such) from the HAR file before sending. This can be done manually or using an addon (such as https://marketplace.atlassian.com/apps/1232593/securely-for-jira-har-cleaner-compliance-automation-free?tab=overview&hosting=cloud).