<mat-form-field>
                                    <input matInput placeholder="Datei hochladen..." [ngModel]="currentFileName" />
                                </mat-form-field>
                                <button type="button" md-button (click)="imgFileInput.click()">
                                    <button mat-raised-button matTooltip="Profilbild des Kontos"
                                        aria-label="Button that displays a tooltip when focused or hovered over">Öffnen
                                    </button>
                                </button>
                                <input hidden type="file" #imgFileInput (change)="previewImage($event)" />