I have Admin access, but whenever any of the lookup files is opened through Lookup Editor, it gives me a warning message saying that "The requested lookup file does not exist". But when I open the lookup through a search query, I am able to get the details present in the lookup. Below search query is used.
|inputlookup append=t LookupName.
Lookup has Read permission to everyone and there is no write permission mentioned for any of the users. Also, even if I give write permission to Admin Role, I am still unable to open the lookup through Lookup Editor App.
what's the lookup sharing level of your lookup?
to be visible in Lookup Editor, it must be Global.
You can check this at [Settings -- Lookups -- Lookup table files -- Sharing column].