Uploads failing

We are designing a site for a church using CMS builder as a backend CMS solution. It is a really wonderful solution for allowing the client's appointees to be able to update the site on their own. One such area that will be updated by church volunteers is an "audio" section. On the "audio" page, there is Flash-based audio player that loads multiple audio files from a folder and the site visitor can select the file to play within the Flash audio player. I set up the upload field in the CMS administrator to have uploaded files go into this specific folder (in the advanced features). For this client, the audio consists of the Sunday morning sermons, which are about 30 minutes long and about 15 MB large as mp3 files. Now, in order to allow the site visitor to download the files (which they cannot do from the Flash player) I am adding the CMS uploaded files code to the bottom of the page, so that any files they upload, in addition to being playable in the Flash audio player, will also be available to download from the bottom portion of the page.

Here's our issue: Smaller files will upload fine and integrate into the Flash audio player, as well as appearing at the bottom of the page to be downloaded. However, these "sermon" audio files will not upload. They process for a couple of minutes (longer in Firefox) and then you get the following error messages:

In Internet Explorer: "The page cannot be displayed."

In Firefox: "The connection was reset - The connection to the server was reset while the page was loading.
* The site could be temporarily unavailable or too busy. Try again in a few moments.
* If you are unable to load any pages, check your computer's network connection.
* If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web."

I contacted the hosting provider and they said that they had no set timeout for uploads, even given the fact that it was being done through our own CMS system (which I showed them). Also, I do not have the "maximum upload size" checked. It is not having a problem with smaller mp3 files, just larger ones, it seems.

Can anyone think of what we might be able to do to overcome this issue? My only idea so far (and one I'm not really excited about because it's not a very streamlined solution for the people who will update the site) was to just teach them how to FTP upload the files to the "audio" folder. However, I then have the issue of those files not showing up in the download area at the bottom of the page.

Thanks, in advance, for any advice.

Jeremy