Step 01 : Create a file Request

1. Sign in to dropbox.com.
2. Click Files.
3. Click File requests.
4. Click Create a file request.
5. Under What are you requesting?, enter a name for the folder that will store all collected files.
6. Under Where should these files go in your Dropbox?, you'll see the path to the new folder populate. If you'd like to change the folder's location, click Change folder.
7. If you’re a Dropbox Professional or Business customer, you can add a deadline for these submissions. Click Add a deadline to set your deadline. You can also Allow late uploads and choose a timeframe.
8. Click Next. 
9. You can click Copy link to copy the file request link and send it to anyone you want to request files from.  
10. Or, you can enter emails of the people you need files from and send the file request directly from Dropbox.
11. Click Done.

You’ll receive an email whenever people upload files to your file request. 

https://help.dropbox.com/files-folders/create-file-request 

Step 02 : Invite people 

follow this article to learn how to invite people to upload files to my file requests: https://help.sunwestsd.ca/support/solutions/articles/22000216682-how-do-i-invite-people-to-upload-files-to-my-file-request 

Step 03 : Get File request folder link

1. Click the File Request you created
2. Click "Share Folder" on the right 
3. Click "Create link" then "Copy link"

Step 03: Create button on Your Online Course

use the file request folder link to create a button on your online course