Exporting kmail data in the predefined way, did not save emails. The predefined path is „file:/home/oliver/.local/share/local-mail“. All Information was saved but no emails from folders and subfolders.
In my case, the folder "/home/oliver/file:/home/oliver/.local/share/.local-mail.directory/" with the all including folders, subfolders and emails were not saved.
STEPS TO REPRODUCE
1. open kontact or kmail
2. open extras - kmaildata im/export
3. open menue - data export
4. close all KDEPIM Apps prior exporting as recommended
5. press continue
6: check generated zip archive for saved emails
emails are not saved
emails should be saved like in older versions. Save the ...".local-mail.directory" in addition to ..."local-mail"
OS: openSUSE Leap 15.1
KDE Apps: 19.04.2-lp151.107.1 (kmail)
OS type: 64-bit
APU: 4 × AMD A10-7800 Radeon R7, 12 Compute Cores 4C+8G
mem: 14,7 GiB RAM