UploadFileInfo constructor
使用filePath
创建上传文件
仅native端支持
Implementation
factory UploadFileInfo(String filePath,
{String? fileName, String? mimeType}) {
fileName ??= basename(filePath);
mimeType ??= lookupMimeType(fileName);
return UploadFileInfo._raw(
stream: null,
filePath: filePath,
fileName: fileName,
mimeType: mimeType);
}