You can easily make a button. But the button should either be placed inside the portal row or the script should be made so that you go to the correct portal and then the correct portal row (like the last one) to insert a file.
You also have to specify the container field you will be placing your file in.
Okay thanks, maybe that's the problem I'm having because the button pops up an error about in order to use this button you must insert or press tab on some field. Googled it but didn't find anything on what that meant, but didn't realize I had to specify the container field, so let me check that again as that would probably do it thanks!