What do the Image Sizes mean in Zoho CRM Email Templates?

What do the Image Sizes mean in Zoho CRM Email Templates?

Below you can see the image options in email templates: Banner, Fit, Small, Medium, Original, Custom.

Can someone from Zoho please share with me:
  1. What each is/means?
  2. How each will look on desktop AND mobile?
  3. How to edit "custom"?  If I choose "Custom" there are no options to customize the image.

Example A:  I would assume using "medium" would be between small and large, but there is no large. The desktop and mobile views are very different.  Look at the example images below with the #6.  It is the same image in both, but mobile view is gigantic.

Example B:  If I use "original" on the mobile version, my 57x57 pixel number displays properly (See Image #1 with red arrow).  While the desktop version displays the image at about 95x95 pixels (See Image #1 with purple arrow).

I'm using Chrome.

Can anyone share any insights as to what I may be doing wrong?  Could Zoho's code be messed up?  Thanks.

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