1) You have only 1 file upload behavior, if you are going to save the files to the server, you need an upload behavior for each file field.
2) In the attachments section, you have bound to the file field form elements, instead, you need to use the server file name and server file directory bindings created by the upload behavior.
on the bindings panel, there will be a binding group for each upload behavior named:
"WA Uploaded Files (<file field name>)"
for each attachment, select the Server file directory binding from that binding group, then copy the binding code and select the Server file name binding. Paste the server file directory code in front of the server file name code.
NOTE: if you don't need to save the files to the server, you can use the submitted file option instead, but this only works if you don't have the file upload behaviors
