Entire file .flv will not upload

I am using Dreamweaver CS4, I used the insert command for flash media, then updated the properties appropriately, as far that I can tell. I am using FireFTP to upload to my website, but the entire video will not play online. The local file is complete, I tried re-uploading a couple times. I dont know why but on the FireFTP control panel the file size is a tad smaller on both the local and server side, than it actually shows when I look at the properties of the file from my desktop.(MacOSx4). Any idea what is going on?