well, if you want to upload a document or file, and if you are on a free hosted space, there are limitations to file types.

3. Free hosting accounts are limited to the following file types:
.htm, .html, .shtml, .gif, .jpg, .png, .txt, .swf, .mid, .rmi, .au, .wav, .js, .css, .ico, .bmp, .class, .dcr

anything else like a DOC file is not allowed.

you will need to elaborate more on what your are uploading.