When using mirosign, logo images and animated logos are uploaded and then served in your email signature. Mirosign uses image servers with a media optimizer and multi-CDN infrastructure for image uploads, storage, transformations, optimisations and delivery. This ensures optimised visual media assets that load quickly and clearly in recipients inboxes. The MetaDefender Anti-Malware Protection ensures the image server is reputable to avoid spam filtering by email recipients. For these reasons it is not currently possible for you to host your own logo image files. It is better and safer for you to use Mirosign image distribution.