Hi , To explain, I upload a file and when I try to upload another file it should replace the previous file(Like it should accept only one file). How to do that? And here Upload is an action button
The file is an object in your database and a file in your filesystem. If you create a new DB object for your file, a second file will be stored. If you reuse the object you already created for file 1, the existing file will be overwritten when uploading a new file.