Issue Summary

When an Excel file is attached to a Jira ticket, the in-browser attachments preview displays incorrect or misleading information. However, downloading and opening the file locally shows the correct data. This inconsistency may cause confusion or incorrect decision-making for users relying on the preview feature.

Steps to Reproduce

• Create or open a Jira work item.
• Attach an Excel (.xls) file containing data.
• Click on the attached file to view the preview within Jira.
• Observe the data shown in the preview.
• Download the same file and open it using Microsoft Excel or another spreadsheet application.
• Compare the data in the preview with the data in the downloaded file.

Expected Results

The data displayed in the Jira preview should match exactly with the data in the downloaded Excel file.

Actual Results

Attachments preview displays incorrect or misleading information

Workaround

Download the attached Excel file and open it locally using Microsoft Excel or another spreadsheet application to view the correct data.