Hi. I tried this package. I noticed that default saving location when I tried to save newly created PDF is pointed to wrong location which is:
run/user/1000/doc/--------
where ------- is something like "kfdjuh37"
I faced with such issue with pdfslicer & it's developer fix it - see: junrrein/pdfslicer#72
Also, I faced with such issue with PDF Mix - see: https://gitlab.com/scarpetta/pdfmixtool/issues/13
The diffirence with Master PDF Editor is that even when I select other location like /home/myusername/Desktop & save, the document saved to same wrong location !! So, in pdfslicer & PDF Mix it was possible to overcome this issue when user change location to other one. But with Master PDF Editor even this work around not working at all !