Hi Jorge
The max filesize is not only handled by EDocman but also handled by your server settings (the upload_max_filesize directive in the file php.ini).
So for max files which you cannot upload, I think you should upload it via FTP. Then go to EDocman->Configuration, find the config option "File Upload Method", set it to "Choose file from server".
Now, when you create a new document, you will see a dropdown which list all the uploaded files and you can choose it for your documents.
That will solve your issues.
Tuan