I don't know why sometimes acrobat don't work when uploading big PPTX to convert into PDFs - it got stucked 2 times and now i'm using the web version to get this done - please check team from your side
Hope you are doing well and thanks for reaching out. We are sorry for the trouble you are experiencing.
If this is only occurring with large PPTX files, it could be due to the file size or complexity (like heavy images, animations, or fonts) causing the Acrobat application to lag or get stuck. Sometimes, the application version struggles with bigger files, while the web version handles them a bit better.
Would you mind sharing the version of the Acrobat Application you are using? To check the version go to Help > About Acrobat and make sure its updated to the latest version 25.01.205XX. Go to Help > Check for updates and reboot the device once and see if that works.