Log in to your Mango Display Account.
On the display dashboard, click the menu button in the upper left corner.
Then select 'My Files'.
You'll then see a list of the files (such as photos, documents, etc.) you've uploaded. You can switch between list view and image view by clicking either of the two buttons on the right.
To Delete files: Select the files you want to delete and click 'Delete' in the upper right corner.
To Upload a new file: Click 'Upload File' in the upper right corner next to 'Delete', select the files you want to upload and you're done!
Please note that video files cannot be uploaded to 'My Files'. They can be served directly from a link from YouTube, Vimeo, Dropbox or Google Drive.