tokenURI returns empty string everytime about erc721a

[Vectorized]

The data parameter in _safeMint is for forwarding to the onERC721Received function on the mint recipient, if it is a contract. See https://chiru-labs.github.io/ERC721A/#/erc721a?id=_safemint.
If your use case is for minting to wallets (most NFT projects), it is not required.

Say if your baseURI is https://ikzttp.mypinata.cloud/ipfs/QmQFkLSQysj94s5GvTHPyzTxrawwtjgiiYS2TBLgrvw8CW/,
and URI of tokenID 123 is https://ikzttp.mypinata.cloud/ipfs/QmQFkLSQysj94s5GvTHPyzTxrawwtjgiiYS2TBLgrvw8CW/123,

this is how you'd do it:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "erc721a/contracts/ERC721A.sol";

contract MyNFT is ERC721A {

    constructor() ERC721A("MyNFT", "MNFT") {}
    
    function _baseURI() internal view override returns (string memory) {
        return 'https://ikzttp.mypinata.cloud/ipfs/QmQFkLSQysj94s5GvTHPyzTxrawwtjgiiYS2TBLgrvw8CW/';
    }

    function mint(uint256 quantity) external payable {
        // _safeMint's second argument now takes in a quantity, not a tokenId.
        _safeMint(msg.sender, quantity);
    }
}

[Anarr]

@Vectorized thank you, maybe I missed something from doc. It works!

[honorableCon]

Can we set custom URI like _setTokenURI from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";