doc: add best practice for uploading driving video

.gitignore

@@ -15,3 +15,4 @@ __pycache__/
 # Temporary files or benchmark resources
 animations/*
 tmp/*
+gradio_cached_examples/

assets/gradio_description_animation.md

@@ -1,7 +1,17 @@
 <span style="font-size: 1.2em;">🔥 To animate the source portrait with the driving video, please follow these steps:</span>
 <div style="font-size: 1.2em; margin-left: 20px;">
-    1. Specify the options in the <strong>Animation Options</strong> section. We recommend checking the <strong>do crop</strong> option when facial areas occupy a relatively small portion of your image.
+1. In the <strong>Animation Options</strong> section, we recommend enabling the <strong>do crop</strong> option if faces occupy a small portion of your image.
 </div>
 <div style="font-size: 1.2em; margin-left: 20px;">
-    2. Press the <strong>🚀 Animate</strong> button and wait for a moment. Your animated video will appear in the result block. This may take a few moments.
+2. Press the <strong>🚀 Animate</strong> button and wait for a moment. Your animated video will appear in the result block. This may take a few moments.
+</div>
+<div style="font-size: 1.2em; margin-left: 20px;">
+3. If you want to upload your own driving video, <strong>the best practice</strong>:
+
+ - Crop it to a 1:1 aspect ratio (e.g., 512x512 or 256x256 pixels).
+ - Focus on the head area, similar to the example videos.
+ - Minimize shoulder movement.
+ - Make sure the first frame of driving video is a frontal face with neutral expression.
+
+Auto cropping will be available soon. 🤗
 </div>