No you can't do this. Basic UI interface means you can type it in, you can't type in an array of byte.
So that means code, it's not hard, but I would recommend you consider storing the a url / filename in the table and then putting the file on the file system instead of as a blob in the table.
Files in database blobs does have some benefits for local deployment, in that you don't have to worry about some muppet making them inaccessible. Server side though that is far less of a worry. As long as you back up database and file system and come up with a reasonable directory and file naming structure its much less of a cost than bloating a database with a load of stuff you can't use in a query, not to mention it tends to make a fair mess of volume (mdb) file.
Oh and there are persistant rumours that MS are going to drop blobs over 8000 bytes as well.