Concering the Content Conversion connector: https://docs.microsoft.com/en-us/connectors/conversionservice/
could you please add a function to convert from Excel files from .XLS format to .XLSX format.
You can convert XLS to XSLX, DOC to DOCX, PPT to PPTX using actions from Plumsail Documentsconnector:
Please review this article. It describes how it works.
Thank you so much @anton-khrit this did exactly what I needed and the tutorial article you reference is very easy to follow!