Upload Multiple Documents, Explorer Views Disabled or Missing in SharePoint?

Found Upload multiple documents and Explorer views are disabled (in some cases, they are missing!) in a SharePoint 2010 site!

Solution

Here are the possible causes and solutions for upload multiple documents, explorer view disabled or missing in SharePoint 2010:

1.  As of now, This feature is available only in IE 32 bit. (Not in 64-bit Internet Explorer, Google Chrome, Firefox)
2. Try adding the site in Trusted sites’ list in IE
3. Check whether You have not enabled “Client Integration” in SharePoint
4. IE security setting may be blocked the STSSYNC ActiveX add-on – Enable it from “Manage Addons” in IE (Check for STSUpld UploadCtl Class.
5. This feature depends on Ms-Office, check whether you have Office installed on the client. If you have it installed, Try running the office diagnostics or even try re-installing office
6. Disable the IE ESC if enabled!
7. Check the path of the folder in which you are trying to upload. It should not exceed the 256 character limit.