我正在学习前端，并试图实现文件拖放。我读了指南和文档，并试图实现这一点，但当我拖动文件的事件工程，它没有文件在数据传输。
超文本标记语言：

<form
            id='upload-profile-avatar'
            class='form form-upload-avatar flex-column-centered flex-centered gap-10'
            action='/change_avatar'
            method='POST'
            enctype='multipart/form-data'
        >
            <div class='flex-column-centered flex-centered gap-5 upload-avatar-modal__image'><img
                    class='upload-avatar-modal__picture'
                    src='/img/upload.png'
                    alt='upload image'
                />
                <span class='upload-avatar-modal-image__message'>Drag Here</span></div>
            <div class='flex-centered upload-avatar-modal__alternative'><span
                    class='font-size-14 upload-avatar-modal-image__message'
                >or</span></div>
            <div class='form__input form__input-upload-avatar'>
                <button
                    type='button'
                    data-action='choose'
                    class='btn btn-upload-avatar padding-5-10 border-radius-5 font-size-16 font-weight-bold'
                    form='upload-avatar'
                >
                    <span>Upload<input
                            type='file'
                            data-name='upload-avatar'
                            accept='image/jpeg, image/png'
                            class='input input-upload-avatar'
                            name='user-avatar'
                        /></span>
                </button>
            </div>
            <div class='upload-avatar-modal__avatar-preview'><img
                    class='avatar border-radius-10 avatar-preview__image'
                    src=''
                    alt='avatar-preview'
                /><div class='flex-centered upload-avatar-modal__undo'><button
                        class='stratch-layout flex-centered border-radius-5 btn btn-revert-change-avatar'
                    ><img src='/svg/close.svg' alt='undo-change-avatar' /></button></div></div>
        </form>

字符串
我把文件放在这个表单上。JS：

const dropAvatarHandler = (e) => {
        e.preventDefault();
        console.log(e);
        const file = e.dataTransfer?.files[0];
        if(!file)
        return;
        e.target.querySelector('.input-upload-avatar').files[0]=file;
//function which does something with files
        previewAvatar(e);
        
    }
    const dragoverAvatarHandler = (e) => {
        e.preventDefault();
    }
        document.querySelector('.form-upload-avatar').addEventListener('dragover',dragoverAvatarHandler);
        document.querySelector('.form-upload-avatar').addEventListener('drop',dropAvatarHandler);

型
console.log告诉我没有文件，但我删除了一个文件。根据指南和文档，它必须工作，但我没有看到问题。
我试了一些指南，但它仍然不工作。