If you want to e-file, you cannot attach anything. The best option is to summarize your entries in TurboTax so that you can e-file. It doesn't matter if you use the Gambling winnings on a W-2G entry or the Other winnings not on a W-2 - it all goes to the same place on the tax return.
Always keep detailed records. In the event, the IRS sends you an inquiry, you can provide the details then, either as a printed out document you can mail or you can use the IRS Document Upload to upload your spreadsheet directly to the IRS. @cmelcher52384
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