I cant send photos on watspp from my 15 pro max

You might have limit WhatApp’s access to your photos. To fix it, go to WhatsApp, open a chat, then look for “+” sign on your WhatsApp, choose photos and the iPhone will give you a pop-up choice which you can give WhatsApp limited access, full access or no access at all to your photos.

WhatsApp is not an Apple product. Contact the app developer here --> App Support or WhatsApp FAQ  Or Restoring your chat history - WhatsApp FAQ or Contact WhatsApp

WhatsApp Business is not an Apple product. Contact the app developer here --> Developer Website  or App Support  or WhatsApp business products - WhatsApp FAQ