Files on Mac are locked to other users on share

Is there a way that it auto logs in when people click on aliases?

That is essentially what it should be doing. The only thing I can think of is the server isn't making a connection fast enough and the request times out.

Is the server available? Not sleeping?

I'll have to test it later on to see if I get any similar errors.

Since about Catalina, connecting to a network share has started using appleID or user account name to connect, initially. If that is not the share user, then it fails. So, that may be what it is doing. I'm not sure what to do to make that connection using the correct credentials.

That ACL contains full access to everyone in the group.

Multiple groups would allow you to give some users less privileges, or give users access to different shares depending on the group.

File Sharing isn’t a file server. You need to add an ACL to make it work like that.

chmod -R +a "group:<groupName> allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,file_inherit,directory_inherit" "Path/to/directory/"

You should create all the users as Sharing Only users and create a group for them.

Regular user accounts have a home folder they don’t likely need, and they have access to everything on that Mac as if they were logged into it.

In the ACL above, Change <groupName> and the /path/to/folder and run it in Terminal.

If you edit the string on a word processor, it might change the double quotes to curly quotes, which won’t work. Change them back to straight quotes.