AE template entity layer can replace the material picture, but video can't. Why?

In Adobe After Effects (AE), if the picture material can be successfully replaced, but the video material cannot be displayed, the possible reasons include:

Video format compatibility: AE may not support the format of video files. Ensure that the video format is compatible with AE.

Layer setting problem: Check whether the video layer is accidentally hidden or improperly set, for example, the transparency is set to 0.

Cache problem: AE sometimes needs to refresh the cache to correctly display the newly imported video material.

Video codec problem: The codec of video file may not be compatible with AE. Try to convert the video format or codec.

To solve these problems, we usually need to check the supporting documents of AE, confirm the compatibility of video format and codec, and adjust the layer and project settings appropriately. If the problem persists, you may need more detailed error information to troubleshoot. During the operation, be sure to back up the project to prevent data loss. If you are not familiar with AE, you may need to seek professional video editing help.