check be added for files/dir already exists.

Is your feature request related to a problem? Please describe. It would be good to add this feature as this is the standard functionality with other copy, paste, move or upload behaviour.

Describe the solution you'd like When uploading a file to a directory if file with same name exists user should be notified and the file should be uploaded with -copy appended to the file name. Similar behaviour when doing move of files among directories.

Describe alternatives you've considered Make sure I don't have a file with the same name in the directory.