Canon EOS 70D(W) Instruction Manual page 25

Reducing the Size of the Image to Send
When [Send selected] is selected, the confirmation screen for sending
images also lets you select the size at which to send them.
All images to be sent at the same time are resized except those that are
already smaller than the selected image size.
Movies cannot be resized.
[Resize:S2] and [Resize:S3] are enabled only for still photos shot with
the EOS 70D. Images shot with other cameras are sent without resizing.
The file size (total size) is based on the file sizes before resizing the
images.
1
Select [Resize images to send].
On the confirmation screen for
sending images, press the <V> key
to select [Resize images to send],
then press <0>.
2
Select the image size.
Press the <V> key to select an
image size, then press <0>.
3
Send the images.
Press the <V> key to select [Send],
then press <0> to send the images.
Sending Images
25