We did not manage to add the fix in previous release, it should be ready for next one (16.09). There is a workaround you can use for now:

Add #uploader template variable to the input with type file in the component html template:

<input #uploader type="file" mdbFileSelect (uploadOutput)="onUploadOutput($event)" [uploadInput]="uploadInput">

Then in your component ts file use ViewChild directive to get access to this element:

@ViewChild('uploader', { static: true, read: ElementRef }) uploader: ElementRef;

If you use Angular and MDB Angular v7.x.x, you need to remove the static: true:

@ViewChild('uploader', { read: ElementRef }) uploader: ElementRef;

Now you can reset the file input in startUpload method to resolve the problem:

  startUpload(): void {
      const event: UploadInput = {
      type: 'uploadAll',
      url: 'url-to-backend-endpoint',
      method: 'POST',
      data: { foo: 'bar' },
      };
      this.files = [];
      this.uploader.nativeElement.value = '';
      this.uploadInput.emit(event);
  }