US Immigration from Bangladesh

I am filling out the DS-260 (F41 Visa Class) for my sister, her spouse and her child who live in another country.

My sister's child is going to turn 21 in about 7 months. By this time, I will turn in the Visa application and the necessary documents.

We waited 14 years to have this I-130 petition approved, and I would hate to have any issues because of this.

So, will there be any issues to the case because of his my sister's child's age?

Does anyone know the specific requirements of uploading Photographs to the online CEAC Visa portal? I know that on the day of the interview, you have to bring a 2 x 2 picture on photo paper. But for the online CEAC portal, are there any size or quality specifications besides the fact that the file has to be less than 2MB?

I have two jobs, but in Part 6 of the I-864, it says: "Employed as a/an" which implies that it leaves space for one job only, as it is a singular phrase. I have two different job titles for my two jobs.

So on #1, do I only put my job title for Employer #1? What do you suggest that i put for #1 if my job positions for my two jobs are different? (Btw I cannot type any slashes to separate the job titles in #1)

I am electronically filling out the I-864 on Adobe Reader, however, it is not letting me type "NONE" or "N/A" into the "USCIS Online Account Number" and "Alien Registration Number" fields, since those are not-applicable to me. So what should I do?

The USCIS instructions state: "If your answer to a question which requires a numeric response is zero or none (for example, How many children do you have or How many times have you departed the United States ), type or print None, unless otherwise directed." But it doesn't let me do that

I am filling out an I-864 Affidavit of Support (I am the petitioner), and my spouse is filling out an 1-864A because I need his income to meet the 125% HHS Poverty Guidelines. My spouse and I have a joint checking account at the bank, and we want to show that as proof of assets (my spouse and I both own this bank account).

So in Part 7 of the I-864, do I enter this checking account balance as my assets? And then, do I add this checking account balance again on the I-864A? I was concerned because on the I-864, it asks for the "household member's assets from Form I-864A" which is both of our money... so I wasn't sure if I could put it twice. But if I did, it would be added twice. Does anyone know what to do?