iOS Question Publishing - confusion over what "archive" is uploaded to iTunes Connect

I'm about to attempt to publish my first app and have been following the directions in this thread:
https://www.b4x.com/android/forum/threads/publishing-your-app-to-the-app-store.57528/

In post #1 of the above thread the statement is made (my emphasis in red):

As written in the message the ipa file is inside Archive.zip. You need to take the ipa file and upload it with Application Loader (on a Mac) or upload it with the hosted builder: https://www.b4x.com/android/forum/threads/b4i-v2-30-beta-has-been-released.59124/#post-372309

Click to expand...

When you follow the second thread you get shown the following image which says to upload the archive file:



If I look at the Archive.zip I have generated I find it contains an *.ipa file and a file called dsym.zip which is of a similar size to the *.ipa.

A google on "ipa apple", the Wikipedia hit reveals "An .ipa file is an iOS application archive file which stores an iOS app" - i.e. it is an "archive" too.

So what do I upload to iTunes Connect:

• the Archive.zip
• the *.ipa extracted from the Archive.zip

I assume it is Archive.zip?

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EDIT - if I could work out how to delete this thread I would.

I tried uploading the Archive.zip and it worked - it looks like the [iTunes Connect Uploader] tool actually unpacks the *.ipa file from the Archive.zip and uploads that - another wrinkle.