I can not "Re-FILE" 2017 tax. I can not find the "Re-FILE" option on the "interview".
I am able to see the "Re-FILE" on 2020,2019,2018 tax years.
I checked the CRA website, Ufile should to the 2017 tax year.
UFile ONLINE
2020, 2019, 2018, 2017
https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/netfile-overview/certified-software-netfile-program.html