Mac mini: Collaboration and file sharing options

I agree with @Rudegar, sharing an Apple Account with others is never a good idea.

If you are looking to collaborate with others and need to file share, there are systems in place that allow that. MS Teams and Google Drive are two that come to mind.

You can use iCloud Drive by sharing specific folders with others to whom you have invited and given permission.

Use iCloud to share and collaborate on files and folders - Apple Support

Share files and folders in iCloud Drive on iCloud.com - Apple Support

However, this process does not include sharing the same Apple ID Account.

Another option for sharing files is Dropbox. You will need one person to set it up and manage the access options and general control of its use.

I have used this in the past when collaborating on projects and seemed to work well. You just need to be mindful of how you organize it, especially if it is a large project as it can get out of control rather quickly.

sharing apple id is never ever a good idea

Make sure each family member has a unique Apple Account - Apple Support (SG)

more

why you should not share appleID - Google-

If you plan to share Pages, Numbers, or Keynote documents, Apple has some stringent collaboration guidelines:

Collaborate on documents in Pages, Numbers, and Keynote - Apple Support

As new versions of these applications, or operating system are released, the collaboration requirements may change.