capture local files

[PlayTragic]

I'm trying to build an image maker and am using this lib to download the result but it seems like handling local files causes an error.

Security Error: Content at http://localhost:1234/imagemaker may not load data from blob:

function imageDown() {
        modernScreenshot.domToPng(document.querySelector('#imageSave', {
            fetch: {
                requestInit: {
                    mode: 'cors',
                }
            }
        })).then(dataUrl => {
            const link = document.createElement('a')
            link.download = 'screenshot.png'
            link.href = dataUrl
            link.click()
        })
    }