Issue Summary

Office Excel Macro does not show graphs/images in the Excel file on the Confluence page while viewing.

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Created a Confluence 8.5.18 environment
2. Created a space and a page
3. Uploaded the below sample Excel (or Word file containing embedded image or graph) file that contains an image;
   Test.xlsx
4. Added Office Excel macro to the page and select the uploaded Excel file without changing any configuration for the macro

Expected Results

The graph/image should be displayed properly.

Actual Results

Graph/image is not displayed.

Workaround

add below system property to allow the missing classes for deserialisation

-Dofficeconnector.deserialization.classes.allowlist=com.atlassian.plugins.conversion.convert.html.HtmlConversionData,[B