1. Open Adobe Acrobat on the computer.

2. After opening Adobe Acrobat, click Merge in the upper right corner - Merge files into a single PDF.

3. After clicking Merge, directly drag in the PDF files you want to merge, and then click Merge Files in the lower right corner.

4. Wait a few seconds for the merge to complete, and click Save in the lower right corner.

5. After clicking Save, the PDFs can be merged successfully.