US Immigration from Canada

I know that DS-260 is an online form. I am trying to understand how and when the supporting documents are to be submitted. Is it uploaded online during the DS-260 application or couriered over immediately after DS-260 application or at some point later or just to be brought during the interview?

Apologies if this seems repetitive. I am trying to figure out the most strategic time to change the name on my passport after marriage during the IR1/CR1 process. I have read the previous posts on this, but didn't find one that relates exactly to mine, so I thought I would post here for advice.

1. We got married on Oct 1, and are currently waiting for i130 Approval (submitted on Nov 16 2020, and is actively being reviewed currently). I changed my last name during the marriage, but my passport still has my maiden name.

2. The i130 was files with married name (maiden name was put under "other names"

3. We want the visa and green card to be issued on my married name.

4. The DS-260 form very clearly says the name to be filled should be as per the passport

Would it be ok for us to file the DS-260 with maiden name (which is the name on my passport); maiden name will be put under "other names." Then after DS-260 submission, apply for a new passport and then bring it to the interview? Would that allow the visa and green card to be issued in my married name. Also any issues I could anticipate with Police Clearance Certificates, medical reports etc?

Went through K1 Visa process a few years ago, ended up leaving the US without adjusting status. No green card, no nothing. Long story short, we stayed in contact, never divorced or even filed for a legal separation, and are now attempting to apply for a 1R1 visa.

Alright, so the I-130 clearly asks for an A number (if any) on the form.

My husband says we should leave it blank. He thinks they will assign another one since this will be an entirely different case/process. We tried researching this, but ended up more confused.

So could I ask, please: Should the alien number I already received for the old case be supplied on the new form?

Thanks very much in advance.

Where can I download the DS-260i (instructions for filing DS-260? I thought I had seen the document on the US Department website, but I don't see it there anymore. When I google I get many different documents. I want to make sure I download the latest version. Could someone please send me the link?

We are still awaiting our i130 approval, but I am preparing documents in anticipation of DS 260 application.

I am trying to find information on how one is to obtain PCC for Canada. I went to the both RCMP, travel.state.gov website, and the postings here on visa journey. I learnt that the instructions are conflicting and not clear, and people have had their PCCs rejected in the past for getting the wrong one.

I know the first step is to go to a police station or a RCMP-approved partner agency. My questions are:

1. What is the type of document to be requested - Certified Criminal Record Check "under privacy act" or "other" or "landed immigrant"

2. What documents are required to be taken to the obtain the PCC (any letter from NVC, passport, Canadian PR card etc) (I couldn't find this info anywhere)

3. What is the processing time for the PCC

Thanks for your advice