Import excel to database plugin not working

Did you check the output parameters of the import node? Does it return any error message?

How do you check for the imported data? Through the record or via "Cloud Database"? Records are not automatically synced.

Check the output parameters of smart service and which DB you are using to upload a file?

I always always suggest using the related function provided by the Excel Tools plugin, fn!readexcelsheetpaging().  This allows you to build an expression rule that will convert the excel file to a CDT, then you can use the Write to Datastore service to persist the CDT to the DB.  This allows much more debugging capability and flexibility for converting values as they map to the CDT, etc.

You can upload a sample document to your environment and use it as a rule input to see the conversion occurring this way, much easier to work with.

Sometimes these smart services are finicky where a blank line or value can throw the whole thing off without warning.  This is easily avoidable with the function instead.