Saving Image Firebase (Flutter)

how are you?
I’m having a boring problem, I’m a beginner in mobile development and also a beginner with firebase.
I’m having a problem saving an image in firebase and recovering it, when I fill out the form and select the image with image picker it just doesn’t appear and the firebase returns me null.

sorry to put the code in pastebin, I can’t put long codes here in the stack and I don’t want to pollute the forum

FishManager Class --- https://pastebin.com/HQZaji0H

Trophy Class --- https://pastebin.com/ggpbG4Tz

FishForm Class --- https://pastebin.com/Dk8udGK0

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Author: Erik Mendes