If still it is not solved then you should ask this question to any moderator available here on the community or connect with smartbear support team.
@sonya_m : FYI
Ok, could not differentiate which one is what.
Did some reading and here are some inputs
1. for attachments, Content-Lenth is not required header ( i think it is not send in the part2 anyways)
2. if size needs to be added, then you can maipulate the Content-Disposition header using SubmitListener.beforeSubmit event and update it to add the size.
Refer for an idea.
other relevant posts related to concept:
You can find scripts to modify the headers before sending, so you can add the size parameter to the Content-disposition header using scripts.
In this article:
you can find examples for modifying headers.