In case you need to export your presentation as a PDF file, you can do it by using the "print" feature:
Select a presentation from you want to print from the dashboard
Choose Open printable presentation. The presentation will open in the new window as a printable HTML format presentation
Slides will be organized as follows: starting from the upper left corner, stack by stack from left to right and every stack from up to down.
Choose Print from browsers menu
From print options, activate Background graphics
Then normal print procedures.
Continues from step 7
Select destination Save as PDF
Choose paper size Legal (mainly best possible)
Margins are adjustable
Name the file
You can later convert your PDF file into a PowerPoint presentation through this tool: https://smallpdf.com/