To be able to copy files over from iPad to Samba-shares the enhanced compatibility with Apple SMB clients and interoperability with Netatalk 3 AFP fileserver must be enabled.

Vfs-module is typically missing if you see in tshark messages like:

To get this fixed add to the [global] section in /etc/samba/smb.conf the following command:

The package samba-vfs-modules must be installed prior restarting the smb service.
Check if the package is installed with commands like:

If the package is missing add it with:

Restart Samba: