How to delete a file from an entity which is having System.FileDocument generalization.

Hi All,

I have created an entity which is having System.FileDocument generalization and having some other attributes in the entity. In a list view I am showing all editable fields of this entity and FileManager for uploading file. The requirement is , I need to add a delete button for each record in next screen and when I click on delete button, the file should be deleted and the remaining data must be there. I didn't find any option to delete only the file from the entity So, please provide the solution for this.

And also is there any widget in app store to upload a single file ( I know that DROPZONE is for multiple documents upload) because the FileManager is very basic one.

Thanks in advance.