'Builder.Js 4.0 ( HTML Email & Page Builder | JavaScript) . upload image problem

we are working on the latest version (4.0) of Builder.js ( HTML Email & Page Builder ) and when i tried to upload an image by using add image from "widgets", after i choose image , when i clicked upload nothing happened, i have read the documentation of this plugin (https://builderjs.net/), but there is nothing about image and where is the location of uploaded images should be.

is there any way or link explain this issue?

enter image description here



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