We have problems when we want to transfer the workflows we use on Sharepoint 2010 to Sharepoint 2016.
The same problem mentioned in the microsoft connection.
https://social.technet.microsoft.com/Forums/en-US/81333cad-c11e-4f75-9a06-7229c0eadd02/spd-2013-workflow-import-from-visio-2013-greyed-out?forum=sharepointgeneral
I used this method to transfer workflows.
https://chanakyajayabalan.wordpress.com/2012/01/02/copyingmoving-sharepoint-2010-designer-workflows/
Sharepoint 2016 workflow manager installation and configuration is as follows
https://sharepoint.fpweb.net/sharepoint-blog/sharepoint-2013-workflow-installing-and-configuring/
Can you help me with this?