I got my I-797A approval notice on June 28 2017 at that time I had old passport which is now expired (expired in Oct 2017), now I have renewed my passport (new expiry is till 2027), I have below questions:
For stamping can i use my new passport or will it conflict with I-797A approval (which is approved when I had old passport)?..Fyi - I am eligible to drop the documents under waiver category (Drop box submission).
I think u need to send both passports for stamping.
my case was Little bit similar to you. Attended H1B visa interview, and received a Pink Slip, and it took almost 1 year to clear admin process. during this admin process I have applied for new passport.
After receiving clearance to my admin process, embassy Asked me to submit passports, then I Checked with embassy about my situation on which passport to submit.