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A file upload with Angular needs to be device compatible and secure in transferring user data. An API yields far more engagement on web forms and rewards users with many rich features. The maxFiles parameter lets you limit how many files can be uploaded per session. You can also toggle options from the File Picker menu to call methods after mounting the view. A Custom Source plugin is required to create a custom file object to store and label each user file. The next step is to define a custom source object, which should have the icon and the name, icon.