Is it effective to sign a "partnership agreement" after the establishment of a limited liability company, and should a limited liability company formulate its articles of association or shareholders'

Is it effective to sign a "partnership agreement" after the establishment of a limited liability company, and should a limited liability company formulate its articles of association or shareholders' cooperation agreement? The agreement signed by two people is generally valid, but it shall not conflict with the articles of association. In case of any inconsistency, the Articles of Association shall prevail. Because the company's articles of association are registered in the industrial and commercial bureau and the tax bureau. Limited company has formulated the articles of association before obtaining the business license. The company's articles of association have indicated the company's address, company name, shareholder's name, ID number, total investment, shareholder's contribution ratio, legal representative's name and other company information. If there are fixed assets, it will also be clear who invested in them. A limited liability company, referred to as a limited liability company for short, refers to an economic organization registered in accordance with the Regulations of the People's Republic of China on the Administration of Company Registration and established with the contribution of less than 50 shareholders. Each shareholder shall bear limited liability to the company to the extent of the subscribed capital contribution, and the company as a legal person shall bear full liability for the company's debts with all its assets. Limited liability companies include wholly state-owned companies and other limited liability companies. There are two forms of legal companies in China: limited liability companies (joint stock companies or limited companies) and joint stock companies (joint stock companies).