Hi Kanika,
To begin, it's important to note that Analytics Direct is currently not compatible with Flutter. For an up-to-date list of supported extensions, please consult our latest documentation available here. Analytics workflows can be effectively managed through Edge or Edge Bridge extensions, and you can find further information in the linked migration document.
In case you are utilizing the Edge workflows in Flutter:
Issue 1: Employing the bundled configuration is the recommended approach, and you can find the necessary steps in the associated blog post.
Issue 2: The app should not crash with poor internet connectivity. If that does happen, please raise a ticket with Adobe support. Please share in the verbose level logs, Charles logs with the ticket.