Display custom PopUp on clicking upload button in custom grid

I created the image type field in the grid edit form. Now my requirement is to display the custom Popup when the admin will click on the upload button. It always goes to the local directory for Image upload.

$fieldset->addField(    
        'image',
        'image', 
        [
            'name' => 'image',
            'label' => __('Upload Image'),
            'title' => __('Upload Image'),
            'required' => false,
            'note' => 'Allow image type: jpg, jpeg, png',
            'class' => 'required-entry required-file',
           
        ]
        );

I want to fetch all the images from another server and will display all the images inside the Popup. So admin can choose any of the images from the PopUp.

Can someone help me how I have to create custom PopUp on clicking the Upload button ?