Retirement tax questions

@DanaB27 - Very helpful, thanks! Regarding the conversion (from tIRA to Roth) - I don't need to document this for the 2020 tax return? Is this because it occurred in 2021 even though it was for the 2020 year?

 

Additionally, say I do a backdoor roth the clean way next time around and before Dec 31 2021 (for the 2021 year) and contribute $6k to the tIRA and then convert to my Roth - will this complicate things for next year?