Overview of the Feature Request
Allow dataverse collection admins to add a distinct thumbnail image in conjunction to a Logo Image in rectangle format to display as a banner for their collection

What kind of user is the feature intended for?
(Example users roles: API User, Curator, Depositor, Guest, Superuser, Sysadmin)
Dataverse collection admins

What inspired the request?
Rectangle logos may result in very ugly featured collection thumbnails.

Any brand new behavior do you want to add to Dataverse?
Have two distinct images for the featured collection thumbnail :

And the logo, that can be used as a banner :

Suggested implementation in the Theme and Widget page :

Any open or closed issues related to this feature request?
SPA version :

• Dataverse collection thumbnail in addition to Logo Image as banner (SPA) dataverse-frontend#298
  On the logo deposit part :
• Dataverse Theme - File upload for Logo Image does not have a file size limit if a logo already exists #3680