symbol indicates that a copy will be performed.
If you are sure that you don't want to keep the destination image, you can simply click Replace. Usually, you won't be sure, and in that case you can either:
There are five possible things that can be happening during a copy or move operation, and the relevant one(s) will be highlighted with a small button next to it. The button
allows you to delve deeper into the situation and get a new window:
In the above diagram, the
button is depressed so you can also see the thumbnails corresponding to the source and destination images in a small Thumbnail Palette at the top-right. Now you can easily see if you really want to overwrite the destination image(s). The list on the left shows all the source and destination file names, and selecting one shows you the corresponding thumbnails on the right. In addition, you can uncheck the files that you don't want to copy or move, and keep checked the ones that you do. Then, when you finally click Replace on the original dialog box, only the checked files will be affected. All this is only useful when you have multiple conflicts, as can happen when you are trying to copy a whole folder.
0001.jpg, 0002.jpg etc. When you try to copy images to another folder, you keep getting conflicts. If you are someone who doesn't care what the file names of your images are, you can avoid conflicts altogether by switching on Smart conflict handling in General Preferences (F10). This works by modifying the file names of conflicting files so that they no longer conflict. After doing a copy or move, you will find files called, for example, 0001(1).jpg. The only problem with this approach is that when copying lots of files around you may get so complacent that you will start duplicating images without realising it.