1) The form enconding type is not set to multipart/form-data.
for a file to upload, you must use the multipart/form-data encoding type.
2) There is no file upload behavior on this page
You need to use the file upload behavior in order to upload a file.
in the file upload behaivor, bind the default file setting to the hidden form element.
3) the file upload will create a WA Uploaded Files (File Field Name) binding group. in this binding group is a variable named Server File name.
in the Insert record behavior, bind the file column to the server File name variable.