Importing Excel into Access 2016

I'm using a macro in Access 2016 to import an excel file.  The user inputs the filename into a text box on a form and I need to pass that name to the field name the ImportExportSpreadsheet step in the macro.  It seems no matter how I format the name of the form/field it doesn't work.  I've tried [forms]![formname]![filename] but the macro says it can't find the file and generates a 2950 error.