While I do not know what you found in the searching you did, I suspect that you probably just didn't recognize the similarity between what you found and what the other site was doing. In fact, upber uploader is exactly the same process as your example site was using - a form (in php or html) linked to an uploading script (in this case, written in perl). I also hgave already pointed you to a step-by-step tutorial, with sample code, of exactly this process in an earlier post in this thread.
You seem to still be misunderstanding what the site you pointed to as an example is doing. There is no email getting sent at all ; email has nothing to do with it.
The "sample" script is easy to find, any "file upload script" can be used as an example - I have already pointed you to several places where you can find many such examples.
The process the example site is using has two parts:
1) An html form to collect the clients' information, and collect the "filename" of the file that is to be uploaded and stored. By using "views source" in your browser, you can easily see an "example" of their form to use as a "sample". One of the things you will see is the "action=submit.php" part of the form - "submit.php is the "second part" of the process (it is the script that actually uploads the file, input by the client in the form, and stores it on their server).
2) A script to take the input of the form mentioned in item 1 above and "process" it by uploading the file submitted by the client and storing it on the server. The script they are using for this is called "submit.php", and it appears to allow a single file to be uploaded at a time. You can use a different upload script (as we have already pointed out repeatedly), and even one that collects more than one file name from the form (I think you wanted 5?) and uploads all of them (you will have to modify the form also to collect multiple filenames instead of just one).
The process on that site uses both html (for the form - the form is pure html though the file the form is displayed in can be in html, php, asp, a perl scrip, etc. - any thing that can create a webpage) and PHP (for the processing script that is the forms' "action" - again, that's what they used, you can use any scripting language).
Once again - you can not do this using only html.
If after all of this discussion, you really cannot understand how that other site is doing that file uploading and storing on the server, or how to approach the project, I don't think I can help you further - I just don't know how else to explain it to you.
If this is something you really need done, and you cannot decipher it enough to implement it yourself, maybe you should consider hiring a programmer , or web developer, to do it for you - or maybe someone on these forums could be interested in writing such a thing for you.