Great to have you here in the Community today. As an insight, the TC C-3/4 filing in QuickBooks Online must be done on or before the last day of the month following the end of the Quarter. (April 30, July 31, October 31, and January 31).
You also want to visit your state agency's website and enroll for an e-file and file the form from there.
For more details about being compliant with the state rules and regulations, visit this website: Texas Payroll Tax Compliance. It has thorough details about Unemployment, tax Forms, and tax payment frequency detail.
You always have me here if you have additional questions. Take care always.