The reason for this is the material. The material downloaded from the website is embedded with huge original data. With the use of pictures, they are constantly updated in new documents, so the pictures will become bigger and bigger in the process of using the original materials. The solution is to copy the picture layer into a new canvas, so that these useless data can be emptied. The specific steps are as follows:

Required materials: PS.

First, open the original image file and press Ctrl to select all layers.

2. Right-click the layer, and then click Copy Layer in the menu.

3. When the Copy Layers window opens, click the document arrow and select Use New.

4. Name the new document, and then click OK.

5. After all the original layers are copied into a brand-new document, those useless data can be emptied and the file capacity is reduced.