Relevant products: Exclaimer Cloud - Signatures for G Suite

When you use client-side signatures with embedded images or signatures/signature elements that are rendered as bitmap due to using custom fonts - you will need to allow sharing of documents outside of your organisation.

Setting the Google Drive permissions

To set Google drive permissions:

1. Sign in to your Google Admin console. 
   

   Note: Sign in using your Administrator account - this does not end in @gmail.com.
   For more information, see Google Admin console.
2. From the Admin console Home page, click Apps then click G Suite then select Drive and Docs.
   
   
3. Select Sharing settings.
   
   
4. Under Sharing outside of your organization, select ON.
   
   
5. Check the Allow users in your organization to publish files on the web or make them visible to the world as public or unlisted files box.

If you use client-side signatures without enabling the 'Sharing outside of your organization' option:

There can be multiple reasons because of which you cannot enable the sharing of documents outside your organisation; one of them might be due to compliance reasons.  

Although you can still use the client-side signatures, you will need to use hosted images instead of embedded images. This will also restrict you from using custom fonts, background images or rendering any elements as bitmap.

For more information, see Linked image URL.