These connection credentials are stored in Willow so when using actions such as Upload to SharePoint etc. the action works automatically once a user's credentials are stored. If not used periodically the validity of these credentials will expire.
For Google Drive and Dropbox, we separately store Personal and Business credentials. Clear store credentials action deletes both.
You can clear these credentials only through this screen
When opening the Stored Credentials Panel for edit, you can see only credentials that exist (e.g. if you clear OneDrive credentials, you are not going to see them when you reopen the panel)
If a user clears credentials for all services, they would see a message that there are no credentials stored. If Willow360 requires a users credentials to use an Upload action it will ask for them again.