VoyagerLaravel Watermark Problem

hey guys , i'm working with Voyager(voyagerlaravel.com) , and have some problems.

i have problem with add watermark to voyager Image field

when i Upload the file , nothings happend

this is my Image Bread Field and the aluce.png file is on public root https://ibb.co/4VDrPVF https://ibb.co/wsy9sx7

where is my mistake?

thanks.