To select attachments, click the Browse button (1).

"

Using your mouse, click the first file that you want to upload;
then holding the Ctrl key, select any additional files that you want to upload.

You will see the file names in the area for File Name: (2)
Click Open to finalize your selection. (3)

** If you need to select files from different folders on your
computer, copy the files that you want to upload into the same
folder on your computer, then click the Browse button.