After you file

I use the online version of TT, and recently e-filed the MFJ (Married Filing Jointly) return, and now plan to amend this return using the MFS (Married Filing Separately) status, after the enactment of the 2021 American Rescue Plan.

After the e-file, I modified the original file to see if changing the filing status would help, and it does.

My questions are:

1. does TT know what file was used for filing, or do I have to recreate the MFJ file previously submitted to the IRS since TT-Online only keep in memory the most recent file with the latest modifications?

2. after I create an amended MFS file me, by going into the original MFJ file and removing my wife's W-2 form, can I e-file this amended return? will the old MFJ file be attached as back-up document?

3. for my wife amended MFS return, I understand that I have to go back to the original MGJ file and remove my own W-2; or will TT have a way around it? can I also e-file this second amended return?

4. or does TT know, and ask me all the pertinent questions (about whose income and deductions apply to which spouse...) and generate in the end 2 separate MFS returns, ready for a single new e-file?

Thanks for your feedback.