In the list of documents to be submitted for H1B drop box, it is mentioned that one has to submit current and previous petition. Please clarify, what is the exact meaning of previous petition. Is that the immediate previous petition to the current petition or all previous petitions, since H1B, initially approved. What are the practical experiences of those, who filed H1B drop box, in September,2024 and got it approved. Thanks in advance.
You need to submit supporting documents based on the visa class and questions you fillout in the DS-160.
Its not a requirement to submit past petitions but a recommendation however if you have an approved extension of status petition that with a future starting date then you include the copy of current I-797 and the newly approved. I personally used to include copy of all past I-797.
You are better off submitting documents mentioned in below link, otherwise the consulate will raise 221g requesting whatever documents they want to see before approving your application.