These files are separate actions, so when testing rendering, the actions can be seen as loop animations. But I need a coherent set of actions in my animation. After studying various materials and software, I gave up the idea of using skeletal information and directly creating animations. Instead, use the animation clip editing function in C4D to connect different actions together to form a complete character animation. Then bake the action into a separate model and export it as an abc file.
Based on the images in the imagination and storyboard, create a camera, determine the camera animation path, and set keyframes. Afterwards, according to the needs of the screen, the assets are placed and adjusted, and then the previously baked abd animation files are imported into ue5, and the animation is synthesized after the materials are completed.
When rendering in ue5, when the camera moves away from the object, the tree in the background will gradually disappear. After asking classmates for advice and searching for information on the Internet, I solved the problem by adjusting the specific parameters of the rendering distance for drawing trees.