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There are multiple potential issues that could arise when trying to show a PDF within a PySide2 window in Maya 2020. Here are a few possible challenges that may need to be addressed:

Compatibility: PySide2 may not be fully compatible with Maya 2020, which could lead to unexpected behavior or errors when attempting to display a PDF.
Display method: The method used to display the PDF within the PySide2 window could be causing issues. For example, if the PDF is being displayed as an image rather than as an embedded document, it may not render correctly or at all.
Library dependencies: PySide2 relies on various libraries to function properly, and if these dependencies are not present or installed correctly, it could lead to problems displaying the PDF. This could include issues with image handling, text rendering, or other elements of the PDF.
File encoding: If the PDF file is created using an encoding that is not supported by PySide2 or Maya, it could lead to issues with displaying the content correctly. For example, special characters or fonts may not be rendered properly, leading to garbled or unreadable text.

Overall, there are many potential issues that could arise when trying to show a PDF in a PySide2 window within Maya 2020. Identifying and addressing these issues may require some troubleshooting, experimentation with different methods, and research into PySide2 and Maya documentation.