Calculating carryover

We lost all 2020 turbotax data and didn't get to print after filing! So we downloaded irs transcript for 2020 and need help to make sure that I am entering the figures from that summary. For example, the summary shows only one form 6521 alternative minimum tax amount while Turbotax asks for AMT on each (short term and long term) capital gains/losses. Our AMT on the one summary line for 2020 is 0. Should I simply enter 0 or nothing in each AMT box to calculate carryover for 2021?