While reading the content, the ReadCellValue method throws NotSupportedException: "The RichText value type is not supported". Although the rich text in the cells is not supported, the library could parse the text content and avoid throwing errors.

When importing a document containing more than one Number Formats (numFmts) with the same format code (formatCode) an exception is thrown: System.InvalidOperationException: 'Same item with different index exists.'

Allow users to define sorting.

Exception when exporting a conational formatting rule with no formatting 

This attribute is needed to ensure the text values entered by users will appear in the same way as they inserted them. However, there are customers preferring to decrease the file size and skip this attribute. Expose a setting to allow them to achieve that.

Exception when color does have a complete value.

Setting up a paper size to A1 and exporting the document actually sets the paperSize to 1. 

This leads to inappropriate values when entering the Page Setup options later in Excel.

Some of the required properties are Orientation and Page size.

When using the API for measuring the cell content size the results are not correct.

Expose API that allows you to get the styles colors from the current theme

Such settings are: "Summary Rows Below Detail", "Summary Columns to Right of Detail" and "Automatic styles".

Files exported with SpreadStreamProcessing cannot be read by OleDB consumers

When calling SpreadExporter.CreateWorkbookExporter method and referencing Trial assemblies an exception is thrown: System.ArgumentException: 'An item with the same key has already been added.'

This behavior is observed both with the NuGet packages and DLLs.

It is not observed with Trial DLLs version 2020.3.1019

The space="preserve" attribute defines that the visualizing application must show all the spaces inside a string value. Without this attribute, MS Excel trims the blank spaces of the values.

Currently, this functionality is supported by the SpreadProcessing library. More information can be found in Worksheet Protection and Workbook Protection help articles.

Number formats like this: #,##0.0,,;(#.##0.0..) can not be applied, because the trailing commas in the first part of the format "#,##0.0,," are not supported.

Allow the customers to specify which one of the sheets inside the workbook will be active when the document is opened.

One should be able to add hyperlinks.

Add support for cell border thickness.

Add support for exporting content with strikethrough font effect.