How do I (teacher) share a file with students?

First you must decide if you want to submit a file to a specific user or if you want to send a file to an entire class.

eBackpack LMS
Submitting a File to a Specific User
Upload the file you want to share to eBackpack by clicking the  button in the upper right. Select  and choose the file from your device, eBackpack, or an external service account such as box, Dropbox, Google, Windows Live or One Drive for business.
Once the file is uploaded to eBackpack you can submit the file to a specific user by clicking the Turn in Button . Toggle the Submit to Class tab to Submit to User tab and begin typing the users name in the drop down box. Once the user is selected you can leave a private comment and select to send the file to the user.
Sharing a File (or Assignment) to an entire Class
To share a file to the entire class you can upload a file directly to the class folder or assignment materials by clicking thebutton > select the source > choose the file and select the class folder or assignment/quiz folder from the location tree located on the left of the pop up window.
You can also open an existing assignment/module/quiz/class and click the button. From the folder settings you will be able to add materials under the materials tab.
eBackpack Classic
Submitting a File to a Specific User

Upload the file to your eBackpack.  Find the file within your My Files and click the file name.  Now you can select the Turn In button.  Change the drop down to reflect that you want to send to a user, and start typing there name.  The list should filter the choices based on what you type.  Select the person from the list you wish to send the file to. You can then optionally add a comment and send it to that student.

Sharing a File (or Assignment) to an entire Class
From your Files screen, locate the Class Folder  or assignment folder that you want to distribute a file to.   Now you can click the Add File button .  Add a comment if you wish (all members will see the comment) and click Add File.  Now all users will see the file in their Class/Assignment folder as well.  

Alternatively, you can create new folders to pass out materials.  The first level folders (directly under the main Class Folder) will also have the added capability of notifying students that materials have been distributed and have a homework drop box to collect returned materials.  These folders can also be easily drag/dropped from your My Files to keep the shell of the assignment (without turned in student work) for future years or you can drag/drop to another class to share with that class (eBackpack will automatically create a homework drop box for the new class).