Currently, Imp Director does not store files for personal accounts. All image and audio files must be stored and hosted offsite on a hosting service that is secured with a secured socket layer(SSL). For the layman, if the addresss to the file begins with "https://" you should be good. Externally hosted files help to protect our users by ensuring that content, which may be copy protected, is not stored on the Imp Director web site. Such circumstances could jeopardize all users content and impact the skill’s availability.
We support the use of publicly shared files from your Google Drive account. These accounts are free and allow your ALEXA device to retrieve files significantly faster than any hosting we can afford to provide you. If you don’t have a Google Drive account yet, we suggest that you check out this link for more information on Google Drive