I don't know what the special symbol you mean. If your special symbol is in the form of words or characters, it can still be saved. I take a special symbol and an emoticon as examples. The specific storage method is as follows:

Wechat version is the latest 8.0.29.

1. First open the WeChat "Me" interface, and then click the personal name above to enter the "Personal Information" page (as shown below):

2. You can see the "Name" column inside, and we can click to enter (as shown below):

3. Click the symbol in the lower left corner of the input method to enter the special symbol page (as shown below):

4. I choose a special character in Tibetan here (as shown below):

5. You can see that I have saved it (as shown below):

6. Let's go in again, randomly enter a word related to the emoji, such as "flower", click the matching flower symbol, and then click Save in the upper right corner (as shown below):

7. You can view and save (as shown in the figure below):