Hi Elliot ,
Two points :
1. The answer to your question is 1 MB. Anything above 1 MB in size , and you will have to use a public file-sharing website such as RapidShare , SpeedyShare , DropBox , GoogleDocs , SkyDrive to upload your file to , give others permission to access the file , and then post that access link here.
2. The normal section of this forum for posting general Excel related questions is the Ask An Excel Question section ; the section you have used is exclusively for questions related to the templates Chandoo retails on his website.
If your question is related to such a paid product , please send me details on :
narayank1026 [at] gmail [dot] com
Narayan