Sharing SharePoint folder outside the organization

Go to Sharepoint site, Right-click on the folder you wish to share
Click on Share
Click on Link Settings
Specific People

Tick on Allow editing if you wish to give the users edit access

Select Apply
Add Emails or names if the users have already been added as guests.
Click Send

Users will receive a link in their email. Sometimes they will need to verify themselves to access the files.

If you cannot share files with external users, Please do contact IT team as there are restrictions placed on some SharePoint sites for sharing externally.