To go to the files page, you must first click on your desired client and find 'files' on the client's dashboard.
You can add/delete/edit client files by going to the client's file page and clicking the edit button in the top right corner of the screen.
Once on the edit files page, you have the option of deleting files by clicking on the trash can icon next to the desired file. That will effectively delete a client file beyond recovery.
You can also add a client file by clicking the 'add file' button.
To upload a document, simply click on the "select file" button and you will be prompted for a file.
Once the file has been selected, add notes if necessary and click save.
You and other users will now be able to download the client file and view any notes that had been left.
Note that files that exceed 10MB cannot be uploaded to the client's files page.