I am on the File section of TurboTax. It says, "...just three more steps and we'll file your returns". I click Start on Step 1 and it says "Ooops, we've hit a snag".

Sign off the TurboTax online account.

Clear cache on your web browser - https://ttlc.intuit.com/community/troubleshooting/help/how-to-clear-your-cache/00/26135

Sign back onto your account - https://myturbotax.intuit.com/

If that does not help with the problem then change your web browser to either Google Chrome, Mozilla Firefox or Microsoft Edge