For performance reason, ActivePresenter stores large media files in an external data folder named in the pattern projectFileName_files. You should copy/rename this folder when copying/renaming your project.
For the second issue, each line in Timeline can contain multiple objects which are not overlapped each other.
When a line contains more than one object, it can’t display all object names at the left, so it shows “Objects” instead. You can drag each object (or right-click > Move Up/Down into a New Line) to move it to another line so that each line contains only one object if you want.