In the e-mail window please make sure you have clicked on the "Save" button, after that you can click on the image icon located in the middle of the window and select the image you want to add.
Hello,
We also have a customer on windows who is on 2026-02-28 having the exact same error message after updating.
The title of the messagebox is in our case is: "C:\Program Files(x86)\Han...