Project assets exist in Finder but don't show in the Content Browser on Mac

hi , if you want That prompt comes up , open your .uproject file with text editor, change the UUID of EngineAssociation to a different one,
e.g.
"EngineAssociation": "{2CFE4016-47C9-16E1-72DE-0AA48F1BA3AA}",
to
"EngineAssociation": "{2CFE4016-47C9-16E1-72DE-0AA48F1BA3AB}",