How to attach a statement for your balance sheet?

On the balance sheet, if your C-corporation have "Other current assets" it says I need to attach a statement. How do I do so if those assets are stocks owned through brokerage account? Do I simply list out the company names, number of stocks, and the value of the stocks my company owned on the date of Dec. 31 2024? And would I need to mail in the entire tax form instead of e-filing?