I follow your Guide step-by-step but it has some issues and should be reworked:
Point 8. leads to:
[defaultuser@XperiaXCompact Drive]$ mount /home/defaultuser/Drive
/sbin/mount.davfs:/home/defaultuser/.davfs2/davfs2.conf:22: unknown option
Line 22 in /home/defaultuser/.davfs2/davfs2.conf is:
dav_user mount # system wide config file only
When uncomment this line, davfs moan also about line 23:
dav_group mount # system wide config file only
When uncommenting this line too, the defaultuser can mount it but then the copied files are locked on Windows until i set the Execute-Flag for Others on the copied Files/Dir. But this is maybe a Cross-Plattform Problem with Windows?