In SharePoint 2013 document library, to upload multiple documents , we need to select upload button on the top ribbon and click on the link “Upload Files using Windows Explorer Instead” in Add a document popup.
By clicking on the link, popup window has shown with error message “We’re having a problem opening this location in file explorer , Add this web site to your Trusted sites list and try again” as shown below.
I have added the site in IE trusted sites (Internet Options -> Security ->Trusted sites), But still iam getting the same error.
After goggling some time I have found that we need to enable the “Web client” service in windows services.
Go to Run, Type “services.msc”, press Enter
Check WebClient service, Right click on it, select Start.
If you not able to find web client service in services, need to add “Desktop Experience” feature in “User Interface and Infrastructure”.
After starting the “WebClient” service, refresh the browser and click on the link “Upload Files using Windows Explorer Instead”. Now it will open folder associated to Document library.