Files Missing

Agree with what the expert suggested. What happens when you relink the files? Do they unlink every time you open the project file? What's the version of After Effects you're using: https://community.adobe.com/t5/after-effects-discussions/faq-how-to-find-the-exact-version-of-after-effects-you-re-using/td-p/9972137

Let us know.

Thank,

Nishu

There are many reasons for this (which version are you using? OS?), but usually always "directory" related.

• The simplest reason is that the files were moved relative to where they were when the file was saved (this includes if the folders were renamed)
• Sometimes it is a file directory (structure) error. 
• Sometimes it is a duplicate path error or super-nested directory error.