App development

Hi, I'd like you to understand that I have continuous work coming in and we could be working together for many more projects. To help me understand your expertise on Flutter, i have some questions on the challenges that we had faced and resolved in my earlier projects and i'd like you to reply in detail on if and how your managed to or will be able to resolve these challenges 1. What tool or process do you use for build automation and deployment? 2. How do you handle/Report/Resolve - Random Crash Management? 3. How do you handle 'Permissions Management' in your code 4. Our Project will require accessing files from the gallery how will you do that? 5. Our project will require signup using Google, Facebook and Linkedin, have you done that? if not what will you use? 6. How in flutter would you send multi part files (images/videos)? 7. On one page when i have a filters, the clicking on the filter will open up a new screen and when closed would update the primary screen. This requires a certain pattern to make it work correctly. Do you know what pattern that is