How to combine multiple photos into one photo?

The method of combining photos into one is as follows:

1. Open one of the photos with mobile phone photo retouching software Snapseed:

2. Observing the original picture, I found that there was no room to add another picture, so I clicked Tools and found the extension tool. In the expansion tool, click the middle button, select the smart fill color, drag the left side and expand the left side. Only a small part can be expanded at a time. Step 2 is operated 2-3 times until there is enough space on the left.

3. Click the tool again, double exposure and add photos. Add a second photo.

4. Move to the right position, adjust to the right size, and then click the water drop to make the added photo opaque.

5. Click the Back button (curved arrow) in the upper right corner, then click to view the modified contents, then click the double exposure on the right, and finally click the brush in the small menu.

6. In the new interface, set the double exposure value to 100, and smear it at the position where the photo was just added, so that people can be displayed.