Where did you do the original return? Did you use Turbo Tax? You need to use the 2019 Desktop program to amend. Sorry you can't upload or use a printed or pdf copy.
For prior years you have to buy the Desktop program. You can only buy the download for prior years. You have to buy a separate program for each year. They only sell the last 3 years. You need a full Windows or Mac computer to install it on. Buy the download here
https://turbotax.intuit.com/personal-taxes/past-years-products/
If you don't have the original.tax file you have to first recreate the actual wrong original return. You can use the Forms Mode. Then when it matches each line that you really filed you have to tell Turbo Tax you will mail it so it thinks it was filed. Then you can amend it.
How to amend a Desktop return,
https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-my-2019-return-in-the-turbotax-cd-d...
