It is a 3rd party one, we are using Vayushphare tool, logged a case with Vayushphare, they said, it is a Microsoft bug refer to the same article. We are using current version of teams client and works fine on teams web. Sometimes attachment doesn't show up completely, sometimes it shows but we can not inlargre the image/screenshots are not readable and sometimes even normal content does not show up over teams client. This is really strange, everyone in servicedesk is struggling to get rid of it. Pls look into this. Thanks