Steps
Open the DingTalk desktop app > click Mail in the left sidebar > click the
icon in the upper-right corner > Mail Contacts > click … next to Contacts > Import contacts or Export contacts.
Contacts
Import or Export Contacts
Open the DingTalk desktop app > click Mail in the left sidebar > click the icon in the upper-right corner > Mail Contacts > click … next to Contacts > Import
icon in the upper-right corner > Mail Contacts > click … next to Contacts > Import contacts or Export contacts.