What can be the reason ?
i'm doing it through a regular "Import Spreadsheet Wizard", and get a message "an error occured trying to import file"
File is not open. Made a copy under a different name; still can't import..

can you post the Excel file so we can try it? You might have some blank fields with embedded spaces, or something.

says

"Invalid File" (when it try to upload)
whats that about ?

If you click on the Manage Attachments button you will see the list of what is allowed. If you want to upload an Excel file (or MDB file) you have to zip it first so that it is a .zip file.

uploaded.
(it was a reall tiny file; y zip ?)