When trying to submit my new app to the app store, I noticed Apple has changed its website interface: after updating metadata and keywords and hitting \"submit for review\" I go
After you submit your binary to iTunesConnect it goes into "Processing" state. At some point (e.g. 30 minutes for me), it becomes validated and ready to use (assuming no validation problems). Next, you go to the Builds section of the app on iTunesConnect and click the "+" to select your latest build as the current build for your app. THEN, you can submit for review.
as this screenshot shows:
you have to wait for the binary to be processed and activated before you can select it..
You have to upload a binary for your new App. Then, you wait ~5-20 min while processing and select the plus button and select a binary and save. After that you may Submit for Review. If it takes longer than ~25 min try uploading the binary again.
The chances are you just need to wait for the new build to pass the 'Validation' process. If you go to the new 'prerelease' tab in itunes connect, you can see the status of your new build. Wait until it's ready, and then go back to Versions tab and the + sign will be available next to the Builds section.
I had the same problem. After uploading a new build, the one I wanted to submit for release, I could d not see that build on the versions tab. It was showing up on the prerelease tab. Here is how I got it to show up on the versions tab so that I could submit it for review:
After that, you can submit that build for review.
Try safari browser. I faced the same problem when I was trying to upload from Chrome.