MySQL upgrade from 5.6 to 8.0
Don't use / (or certain other things that could confuse the file manager) in a table name.

Perhaps you can rename it?

Update

OK, S is the database name, AD is the table name.

No, you cannot move .ibd files around.  There is critical information in ibdata1 that will get confused.

It is possible to do

RENAME TABLE X.AD TO Y.AD


(At least that was possible before 8.0.  The internals of 8.0 are radically different; if such a cross-db RENAME TABLE fails, file a bug report with bugs.mysql.com )