AFTER EFFECTS 2021 18.4.1 Bug > Not relinking / replacing missing files
After effects version 18.4.1 stopped replacing missing files as before:
1 - In previous versions when you replaced a missing file that is located in the same folder as other missing files in the project, AE would smartly re-link all files at once.
Now it is not doing this anymore.
2- In previous versions if on the Project panel search bar, you typed "missing"or even just "miss" it would show all missing media in your project, regardless of what type of media it is. Now you can only view missing media by specifically typing "missing footage"or "missing fonts" ", "missing effects". This isn't helpful at all.
Please check this bug and bring it back to the way it was before!
Gabi Vallu commented
UPDATE: it seems to have some relation to .mp4 files.
I was able to replace multiple missing .ai files that shared the same folder by replacing just one of them, just like Ae always did, with no issues.