// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;

contract t1{
   
    mapping(address => uint256[])  AllSpecialNFT;
    uint [] temp;
    function addNewVal(uint _tokenId) public {
        // AllSpecialNFT[msg.sender].push(_tokenId);
        temp = AllSpecialNFT[msg.sender];
        temp.push(_tokenId);
        AllSpecialNFT[msg.sender] = temp;
        uint [] memory ax;
        temp = ax;
    }

    function findSize() public view returns(uint){
        return AllSpecialNFT[msg.sender].length;
    }
   
}

pragma solidity >=0.4.22 <0.9.0;
import './t1.sol';

contract t2{
    t1 _t1;
    constructor(t1 t1_){
        _t1 = t1_;
    }
    function callandAdd(uint _tokenId) public{
        _t1.addNewVal(_tokenId);
    }
}



Guys in this i am trying to update the mapping from another contract but i am not able to do it. Is there any way? Or if its possible please point out the mistake.