Hello,
Yes, PowerPoint can't set alternative text for Tables and Group shapes. Aspose.Slides allows to do it but reaction of PowerPoint is unpredictable. In theory, PowerPoint can simply remove this text when save presentation.
There are 2 other possible workarounds. You can use Shape.Name and Shape.Tags. They can be set in PowerPoint but through VBA only.
May be the most simple is search table by text in a cell? I don't think you have many tables on a slide.
Alexey Zhilin
Team Leader
Aspose Tyumen Team
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