jan-tosovsky-cz commented on issue #987:
URL: https://github.com/apache/poi/issues/987#issuecomment-3707967985
After some digging I am afraid this caused by some PPT content not supported
fully in POI.
Your code, adding slides into the same presentation, produces "Cannot open
the file: A shared part is referenced by multiple source parts with a different
relationship type." validation error in the Open XML SDK Productivity Tool.
I've tried to modify the code to copy slides into the new presentation. That
validation issue has gone, but the output is still reported as corrupted in
PowerPoint. Unfortunately, in this case we have no clue why.
When trying the same code with simple slides only with text and images, the
cloning works correctly.
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