Hello, I encountered an issue with attachment uploads in my Pega application. When I upload a PDF file to Work-Case A, the file is successfully uploaded, but I cannot preview or download it. it's appeared in the Link-Attachment and Data-WorkAttach-File.

For testing, I used Pega's default sections—pyCaseAttachmentsTopWrapper and pyCaseRelatedContent. Interestingly, this problem occurs only with Work-Case A. When I perform the same attachment upload in Work-Case B, the document displays correctly and can be previewed and downloaded.

As a workaround and for testing purposes, I replicated Work-Case A by creating a new case type (Work-CaseAClone) with all the same rules and flows. In Work-CaseAClone, attaching a document and preview it using the same sections works perfectly. This is confusing because Work-CaseAClone is identical to Work-Case A, yet the issue does not occur.

Any assistance or guidance on resolving this issue would be greatly appreciated.