CaritasPWA/wwwroot/image-loader.js

const fileInput = document.getElementById('file-999');
fileInput.addEventListener('change', (e) => LoadFiles(e.target.files));

function LoadFiles(fileList) {
    let file = null;

    for (let i = 0; i < fileList.length;) {
        if (fileList[i].type.match(/^image\//)) {
            file = fileList[i];
            break;
        }
    }
}