Hi Tod

Thanks for your post! An xlsx file imported into Lucidchart is static so it does not support live updates through the data refresh button. If you create your Smart Containers using Google Sheets you will be able to perform live updates without having to import a new spreadsheet file. If you have further questions please let me know. 

Is there any way to upload a new/updated XLSX file and retain the same formatting for smart containers?

Hi Austin thanks for posting! Unfortunately what you are describing hasn't been built out for smart container import but it's a great idea that I'm sure other users would agree with! Would you mind adding it to our feature request form? Once it's submitted that feedback is forwarded to our product team for their consideration. Thanks again for reaching out with your feedback!