SharePoint Designer Form with Multiple attachment buttons

I have a custom form with 3 columns and each one has the option to add files/attachment to the list.

when creating a new item, I am able to attach a file in the first column, however, if I add an attachment in the second or in the third column I am getting the following pop message

" You must specify a non-blank value for File "

screenshot of the form from the SharePoint list and the code from the designer is attached below.

any suggestions on how to fix this problem?

Thank you,

Code from SP Designer

SharePoint List form

Pop up message while attaching file

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