Navigate to Setup Home | Apps | App Manager You can either create a brand new app (1) or edit an existing one (2). If you edit an existing Classic custom app (3) you will need to upgrade it first with the drop down button on the right side of the screen.When you're in Edit mode the way to change the Logo will be available.
Refer this link for more additions n winter 17 https://help.salesforce.com/articleView?id=FAQ-Lightning-Experience-Navigation-Changing-with-Winter-17&language=en_US&type=1
This feature is added in the winter 17 release.
Navigate to Setup Home | Apps | App Manager
You can either create a brand new app (1) or edit an existing one (2). If you edit an existing Classic custom app (3) you will need to upgrade it first with the drop down button on the right side of the screen.When you're in Edit mode the way to change the Logo will be available.
Refer this link for more additions n winter 17 https://help.salesforce.com/articleView?id=FAQ-Lightning-Experience-Navigation-Changing-with-Winter-17&language=en_US&type=1
Hope this helps!
I have done that already and it is showing in classic edition properly. But, in lightning edition it is not visible.
Then when you click on edit you will get to add custom logo like below
Regards
Thank you