See Zoom's Recording Formats resource for more information on how your recording files are created. You can rename this file to something that makes more sense for you if you would like. The video of your meeting will include all parts of the meeting and will always be titled "zoom_0.mp4": Zoom saves a separate file for each meeting component that you use - audio only, meeting chat, whiteboard, etc.
When you click into the specific sub-folder for your meeting recording you will see several files listed.
You can still download your meeting recordings from the Zoom cloud, but having them in your Kaltura account offers more convenience. If you record to the Zoom cloud, then your meeting recording will automatically be added to your Kaltura My Media page for easy sharing and storage beyond the 120-day storage limit in the Zoom cloud. We are now recommending recording meetings to the Zoom cloud. Please note: these directions are for meetings where you have opted to record to your local computer.