you have 2 problems in this page:
1) In the file upload behavior, you need to bind the default file to the image hidden form element.
In the server behaviors panel, double click the upload file server behavior to edit it.
On the second step of the upload file behavior, click the lightning bolt next to default file, from the forms collection select the image form element.
2) In the update record behavior, you need to bind the image column to the Uploaded Files (imageNew) -> Server file name variable from the bindings panel
In the server behaviors panel, double click the update record server behavior to edit it, on the second step of the Update record Behaor, select the image column, then click the lightning bolt next to value.
from the bindings panel, expand the Uploaded Files (imageNew) group, then select the server file name binding.
