If your PDF Archive (My Area > My Apps > PDF Archiving) is not running or you can't download PDFs, then with version 21.1 you have the following option to solve the problem of splitting zip files by days:
Navigate to the PDF Archiving module.
Click on +NEW to create a new entry.
Select the Expert settings box under "Expert mode".
Select the Bundle PDFs into single days box.
Click on Save.
It is important that the process starter "pdfarchiv_app" is activated.
You can find more information in our manual: