Live chatting and Question Answer Project Cross Platform

Hi I am looking for a live chat and question-answer application purely based on below technology stack - 1. Backend : java + spring/spring boot 2. Database: MongoDB 3. Front End : JSP/HTML/CSS/jquery or reactJS or AngularJs any of three option 4. File storage will be AWS This project will be a cross-platform means we can operate this within website + android mobile + IOS mobile all three platform. Please find all features which I need - 1. Private chat. 2. Group chatting. 3. Online status of users in chat. 4. All Active Users Joined the chat session. This will be two Tabbed formats one for live chats and another will be for all active or joined users list. 5. File sharing either image, pdf, txt or doc file (any type of file) also user can be able to open mobile camera click photo and share. (Files will be store in AWS S3 Bucket). 6. Hand Raises facility so that Admin/Host of that chat session can know about that person. 7. For question and answer here one person can ask question and there will be multiple answers. 8. The file-sharing option will be with Question and Answer not with chat. 9. There will be three windows for Host first live chat 2. All Active/Joined Users [login to view URL] and Answers. 10. Push notification on web and mobile app for when anybody comments or ask question reply. (Note* This feature is not mandatory or applicable at every place - Low Priority). 11. Emoji share (Low priority) 12. Audio file share (Low Priority). 13. Typing info feature so that other people in a group or one to one (private) can know that the user is typing (Low Priority). Note* Here we will provide few details on URL with that parameter live chat will start.