At some time you may need/wish to replace a file uploaded into a collection. You can delete the existing file and upload a new file however this will also lose the data associated with the file, for example the caption, keywords, views stats, income reports generated from its sales or to retain its position in the collection.
You may upload a new image to replace the existing image retaining the associated data. To do this follow: Control Panel > My Images > and click on the collection you wish to edit, then click on the thumbnail image to open the file information page. Under the large thumbnail you will see a "Replace" button.
Click on the "replace" button to upload the new image to Replace the existing file.