E-filing an amended return

I e-filed my 2025 federal and state returns the end of February and then a 1099-NEC that I forgot about showed up in the mail. I went in and amended my return but TurboTax is not allowing me to e-file the amended forms but wanting me to print and mail 50+ pages. Any idea why? Both the original returns and the amended ones are very straight forward. Nothing complicated. And the IRS and state of Ohio have already accepted both original returns and my refunds for both have been electronically deposited into my checking account. I see no reason why I can't also e-file the amended forms. Thoughts anyone?

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