Open the left menu. Expand the Resources dropdown list and select My Drive. By default, you will be in the My Lessons tab.
In the listing, click the Overflow (3-dot icon) on the resource you wish to share and click Share.
You may also share a lesson from the View Lesson page. Open the right menu and select Share with Teachers.

Note: You can only share a lesson if you are the owner of the lesson.

Add Teachers to Share

In the Share with Teachers subpage, click Add to select the teachers you wish the share the lesson with.
Search for the teachers by name or email. You can apply the school filter to narrow the search by school.
Select the teachers by selecting the checkboxes next to their names. You may select more than one teacher across multiple pages.
After you have selected the teachers, click Add.
Select the permissions for the collaborating teachers (Can View or Can Edit).
Click Save and X to close the subpage.

Remove Teachers

To change sharing permissions for any teacher, open the Share with Teachers subpage.
Click on the dropdown list next to each collaborator's name to update the permissions.
Click Save to confirm.

(C1,iv) Attach Google Files

(D1,ii) Access a Shared Lesson