Select the picture you want to resize from iPhone photos, then click the up arrow at the bottom left to bring up the interface as shown above, and then select "Email".
2. Then your iPhone will enter the email interface, fill in your email address in the recipient column, and write the subject casually, just write it. Click "Send" in the upper right corner when you are finished.
3. After clicking "Send", the email will not be sent immediately, but will pop up on the page where the picture size is modified. As shown in the figure, a * * * has four sizes to choose from: small, medium, large and actual size. As shown in the figure below: