The most common way to attach files is to create an email, and then apply the Attach File feature to insert file attachments in the message composing window.

1. In the mail view, click Home > New Email to create a new email.

2. In the message composing window, please click Insert > Attach File > Browse This PC.

3. Now in the opening Insert File dialog, please open the specified folder containing files you will attach, select the specified files, and click the Insert button.

Tips: If you need to attach multiple files from the same hard folder, you can open the folder in the Insert File dialog, click to select multiple files simultaneously with holding Ctrl or Shift key, and then click the Insert button.

Now the specified file has been attached in the current message composing window.

4. Please go ahead to add message header information, compose the message body, and send it as you need.

Alternatively, you can quickly attach files as attachments in a composing email by copying and pasting.

1. Open the folder containing files you will attach as attachment.

2. Select the files you will attach as attachments, right click, and select Copy from the context menu.

Tips:
(1) Holding Ctrl key, you can select multiple nonadjacent emails by clicking them one by one; holding Shift key, you can select multiple adjacent emails by clicking the first file and the last one.
(2) After selecting the files, you can press Ctrl + C keys to copy them directly.

3. Launch Outlook, and click Home > New Email in the mail view to create a new email.

4. In the message composing window, put cursor in the message body, right click, and select Paste in the context menu (alternatively press Ctrl + V keys).

Now all copied files are attached as attachments in the message composing window at once.

5. Please go ahead to add message header information, compose the message body, and send it as you need.

You can also apply the Send to feature in the Windows to attach files as attachments in a new email quickly.

1. Open the folder containing the files you will attach as attachments.

2. In the folder, select the files you will attach as attachments, right click, and select Send to > Mail recipient in the context menu.

Tips: Holding Ctrl key, you can select multiple nonadjacent emails by clicking them one by one; holding Shift key, you can select multiple adjacent emails by clicking the first file and the last one.

Now a new message composing window is opening, and the selected files are attached as attachments automatically.

3. Please go ahead to add message header information, compose the message body, and send it as you need.