using Wechat"s sharing function, when sharing PDF files with friends, the right thumbnail is always displayed in red background plus file format PDF. Even if thumbImnage is set up in time, the thumbnail cannot be modified. Can you modify it and how?
as shown in the picture, I want to replace the content of the PDF section with a custom picture.
WXMediaMessage *message = [WXMediaMessage message];
message.title = title;
message.description = description;
[message setThumbImage:thumbImage];
WXFileObject *ext = [WXFileObject object];
ext.fileExtension = @"pdf";
ext.fileData = fileData;
message.mediaObject = ext;
official demo test results are not good. File types such as PDF have special images, and the custom definition is invalid
.