There are several ways,

First, you can open a blank picture found in advance or made with PS (that is, a picture with a white background), then add the materials you need to use to the new picture, and then save your favorite materials as jpg or GIF separately, so that you can use your favorite materials next time.

Also, many materials of Meitu Xiu Xiu need to be networked, and many materials can't be displayed without surfing the Internet, so if you want those materials, you can click the download material package button in the upper right corner of Meitu Xiu Xiu, enter their official website and download those online materials. In that case, can't it be used?

I hope it helps you.