As follows:

Tool: iPhone13

Operating system: iOS14.4.1

Software: Mobile Photo Album 3.0

1. Find the photo you want to encrypt in the mobile phone album, and then click the square shape with an arrow under the camera. As shown in the picture below:

2. After selecting the photo, you can perform related operations. Click the memo below, as shown below:

3. Save the photo to the memo. In this operation interface, you can add a file name to the photo or not. Then click Save at the top, as shown in the figure below:

4. After the photos are stored in the memo, enter the mobile phone memo operation interface and find the photos stored in the memo. As shown in the picture below:

5. Swipe left on the photo. Then the password lock graphic will appear. Click the password lock graphic to perform the password encryption operation. As shown in the picture below:

6. Finally, you need to set a password for the photo to encrypt it, as shown in the picture below: