File previewing problem on Wechat browser ios

I’ve installed my own seafile server on ubuntu and shared a public library. however, when I post my published link on wechat and open the link inside wechat browser, the page itself works, but i can’t click into any file to preview, like pdf or mp3.
File previewing works well on chrome (Windows and ios, but ios one actually uses safari core) and almost all mainstream browsers, only failed on ios wechat. I suppose the problem is because seahub open the previewing page on a new tab, which is not supported by ios wechat. But I’m not sure whether it is the point, also not sure if ios wechat actually supports new tab. I’ve asked o1 and followed its instructions, using vs code to replace all target=“_blank” to target=“_self” in /opt/seafile/seafile-server-latest/seahub/seahub/templates, but it still open new tab on windows chrome.
So what on earth is the key problem and how to solve it?

我在ubuntu上安装了seafileserver的最新版,发布了存储库并把存储库链接放在微信群里。ios微信用户可以正常打开存储库链接,但无法进一步点击文件以预览。安卓微信和电脑微信都可以正常打开,ios手机chrome也可以打开。我怀疑是因为ios微信不支持新标签页,但是我也不确定它到底是否支持。我问了o1,然后对所有/opt/seafile/seafile-server-latest/seahub/seahub/templates下文件,用target=“_self"替换了target=”_blank",但是在电脑chrome中预览仍然在新标签页中打开。请教ios微信不能打开预览的根本原因是这个吗?如何解决?谢谢!