we tested on the lasted Win10 and it worked on our computers.

I tried in MS Teams, Desktop app and it worked in chat. What exactly you struggle with?
If you get some unexpected characters then you may need to introduce a small Key Delay in Preferences/Text Expander/Advanced.

We use the latest Win10.

Thanks for your kind words.

File contents macro does not insert a file. It reads and inserts the file content - the supported formats are non formatted text, html, rtf and image files.

Can you post the command example?

MouseMove command has issues in certain multi-monitor configurations. Try changing it with
The first number is the X-coordinate and the second is the Y-coordinate.

Double-click on a macro field and edit it.

Strange. Do you use another similar software or a clipboard manager? Can you try resetting the Clipboard Manager preferences to see if this helps?
Do you copy a very large content?

Please see the details here:
https://www.fastkeysautomation.com/version5.html

This is currently not possible. If needed, you could simply run the AutoHotkey script (Type: Run)...