We have a feature request logged in our backlog to provide a library that allows working with PPTX files: New Control: Component for working with PPTX files. You can cast your vote for the implementation as well as subscribe to the task by clicking the Follow button so you can receive updates when its status changes. At this point, I am afraid that I cannot suggest you a component for achieving the conversion between PPTX and PDF documents.
Please, let me know if there is anything else I can assist you with.
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