fix

main/boards/zhengchen-cam/custom-emojis/README.md

@@ -1,7 +1,6 @@
 # Custom Emojis
 
-Put your custom PNG or GIF files in this directory, or in `png/` and `gif/`
-subdirectories.
+Put your custom PNG files in `png/` and custom GIF files in `gif/`.
 
 The filename without extension is used as the emotion name. Directory names are
 not part of the emotion name, so `png/neutral.png` is loaded as `neutral`.
@@ -28,8 +27,12 @@ Recommended minimum set:
 - `angry`
 
 If an emotion-specific image is missing, the firmware falls back to `neutral`
-before using the built-in icon. Do not add both `png/happy.png` and
-`gif/happy.gif`; only one image per emotion should be used.
+before using the built-in icon.
+
+For Zhengchen CAM boards, the build selects one subdirectory:
+
+- `CONFIG_ZHENGCHEN_CAM_USE_GIF_EMOJI=y`: use `gif/`
+- unset `CONFIG_ZHENGCHEN_CAM_USE_GIF_EMOJI`: use `png/`
 
 After adding or replacing files, run a full flash so the assets partition is
 updated: