just an idea, i think you need 2 form, 1 for the upload file and store the 
value into session, and put it on another form, using requires = IS_IN_SET()
*e.g. not tested*
*create your 1st form and store the value of uploaded file into session*
a = open(form.vars.upload_file, 'wb').write(session.upload_file)

*create another form that requires IS_IN_SET from the stored session*
Field('choose_excel', requires=IS_IN_SET(for id, value from 
session.upload_file) ),

best regards,
stifan

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