Thank you for the additional information!
If you use the "Print Screen" key on your keyboard the screenshot will be stored in the clipboard of Windows. The forum software will not accept Ctrl V but it will accept pics from file. Common praxis would be to use screen capture programs for this task. You can find a ton of them for free in the www. If you like to stick to "Print Screen" then you need to find a way to save the clipboard content as a file to your computer. While you are on Win11 maybe a Microsoft Program would be the right choice for you.
MS offers a free program called "Paste into File".
https://apps.microsoft.com/store/detail ... X1XTPKZJDJ
After installing this program you are able to save the clipboard content into a file on your computer. This file can then be used to be inserted into a forum post.
Procedere would be:
Hit "Print Screen" on your Keyboard,
launch the "Paste into File" program,
in the up-poping dialog it will ask you where to save the clipboard content,
switch to the forum software - load this pic as attachment to your post.
This tutorial will explain it step by step:
https://www.qcad.org/rsforum/viewtopic.php?f=47&t=3760