Why cant I drag and drop into playlists

Question

I used to be able to drop and drag inrto playlists. Now I get a message which says press + button to add, but there seems no way of doing it. I'm using windows 7

Answer 1

Apple Support Communities updatesI’ve tried the control-I route and then tried to locate the file without success. What I get as a file location starts with //localhost/C:/Users. It may also be useful to know that most/all the missing files seem to have been copied from CDs. I can’t be sure if it’s all because the whole music file has nearly 9000 entries! The ones that still seem to work were copied from an external hard drive.
From: Apple Support Communities Updates
Sent: Wednesday, April 01, 2015 7:30 PM
To: couffin
Subject: - why cant I drag and drop into playlists
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                                turingtest2 has replied to your question. You can view the full discussion in Apple Support Communities.                                                                                
why cant I drag and drop into playlists 
                                The "missing file" error happens if the file is no longer where iTunes expects to find it. Possible causes are that you or some third party tool has moved, renamed or deleted the file, one of its parent folders, or the drive it lives on has had a change of drive letter. It is also possible that iTunes has changed from expecting the files to be in the pre-iTunes 9 layout to post-iTunes 9 layout, or vice-versa, and so is looking in slightly the wrong place. (In the case of a library moved from one system to another there are also potential permissions issues. See Repair security permissions for iTunes for Windows if this might apply.)
                                Select a track with an exclamation mark, use Ctrl-I to Get Info, then click No when asked to try to locate the track. (Due to a bug in iTunes 12 you currently have to say No twice!) Look on the summary tab for the location that iTunes thinks the file should be. Now take a look around your hard drive(s). Hopefully you can locate the track in question. If a section of your library has simply been moved, a folder renamed, or a drive letter has changed, it should be possible to reverse the actions. If the difference between the two paths is an additional Music folder in one path then this is a layout issue. I can explain further if that is the case.
                                In some cases iTunes may be able to repair itself if you go through the same steps with Get Info but this time click Locate and browse to the lost track. It may then offer to attempt to automatically fix other broken links. Although it says something like "use the same location" it expects to find the tracks in the same artist & album layout that it generates, not all in one big folder.
                                If another application like Windows Media Player has moved/renamed the files then the chances are that subtle differences in naming strategies will make it hard to restore the media to the precise path that iTunes is expecting. In such cases, as long as the missing files can be found somewhere, you should be able to use my FindTracks script to reconnect them to iTunes. See this post for an explanation of how it works.
                                tt2
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