Signature shows up on desktops but not mobile.

I have a signature that is an uploaded image that works great when opening on a desktop but if anyone opens it on a mobile device it is just an empty rectangle. Any thoughts?

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Zoho Mail For iPad
We are happy to announce the release of Zoho Mail for iPad. More details here: https://blogs.zoho.com/general/zoho-mail-is-now-optimized-for-ipad. Do try this out and share your thoughts. You can mail to support[at]zohomobile[dot]com, post responses in this thread, hit feedback or simply 'like' the application to let us know what you think. PS: Dont forget to check out the themes. Regards, Gopalakrishnan V Zoho Mobile Team
Zoho CRM for iPhone and Android - Release announcement
We are happy to announce the Mobile Edition of Zoho CRM (Beta) for iPhone and Android devices. This is available for all editions (Free, Professional and Enterprise). How to access? You can access Zoho CRM from mobile.zoho.com with your existing Zoho CRM credentials. After logging in, choose CRM from the list of applications. Feature Highlights Access to Leads, Accounts, Contacts, Potentials (Opportunities), Tasks and Events modules. You can View, Create, Edit and Delete records in all these modules.
Android App for Zoho CRM - Release announcement
We are pleased to announce the release of our Android app for Zoho CRM in Google Market (Google Play). The App is free to download from the App store but you need to activate the "Mobile Add-on" in your CRM account to use the app. The app comes with a 15 day trial period after which users have to subscribe to the mobile add-on package at $3 per user per month (as is the case with our CRM native apps across other platforms like iPhone and Blackberry) to continue using the app. More details on activating
Zoho CRM app for iPhone - Release announcement
We are glad to inform the release of our iPhone app for Zoho CRM in the iTunes app store. More on this announcement is covered in the following blog post. https://blogs.zoho.com/general/introducing-the-zoho-crm-app-for-iphone-and-mobile-web-access Do use our app(s) and keep us posted with your feedback (either through this forum or by emailing us at support[at]zohomobile[dot]com). Shanthivardhan