How can I edit an excel file uploaded to heroku

Question

I am working on a trading bot which works off of tradingview alerts. All has been working well, and now I want to add all the trades the bot takes onto an excel file. However, I am not able to append data to the excel file once it is uploaded to heroku, but I am able to read data off of it. I know there is no error in the code since I have tried using it when I store all the files locally and it works, I believe the problem arises when I have to edit the file which is loaded onto heroku.

def add_to_excel(data:List):
    try:
        wb = load_workbook("Trades.xlsx")
        ws = wb.active
        ws.append(data)
        print(ws['A1'].value)
        wb.save("Trades.xlsx")
        wb.close()
    except Exception as e:
        print("An exception has occured in adding the trade to excel - {}".format(e))

I know that it can read the file since print(ws['A1'].value) returns what is written there, and no error arises, therefore python is interpreting that the data is being appended

Does anyone know how I can edit the excel file and continue to add trades onto my trading journal??