Image content type in Site Asset Image library: The Preview and Thumbnail Preview columns do not display the picture of the item.

I have two different Site Asset libraries.  The Site Asset Picture library has items of
content type picture.  The Site Asset Image Library has items of
content type image. 
1) I do not quite understand the different between a picture content type versus an image content type. 
2) the thumbnail and preview columns do not display the image in the Site Asset
Image Library.  (the image does display in the thumbnail column of the Site Asset Picture library.)  I expected the image to display in the Site Asset Image Library the same as it does in the Site Asset Picture library. 
Why doesn't it?
Betty
Betty Stolwyk

I have subsequently found out that our "Site Asset Images" library is a Document Library to which someone must have replaced the Document content type with an Image content type.  I also found out that picture previews/thumbnails cannot be displayed
in Document libraries.  So the problem was the library type, not the content type.
So I simply created a new Picture Library (whose content type = picture) and copied the files into that and the thumbnails displayed just fine!
I bet what led to this is the default "Site Assets" library that is created for a new Team site.  It is just a document library but sounds very similar to the "Assets" library.  I can imagine someone thinking the "Site Assets" library was a standard
container for images, and simply changed the name to better identify the content! 
As far as 'image' vs 'picture' content types, I noticed that a new Picture Library contains a content type of 'picture', but an Asset Library contains a content type of 'image' (as well as audio and video).  Although the 'image' content type has a few
more fields than the 'picture' content type (picture content type does not have thumbnail), the actual Picture Library contains pretty much all the same fields, including the thumbnail.  So for all practical purposes, either library type can be used for
storage of pictures.  I am guessing that the Pictures Library which uses the picture content type is for backwards compatibility purposes, and that the 'image' content type is newer, being derived from the new "Rich Media Asset" content type and used
in the new Asset Library which can hold audio and video in addition to pictures.  
Microsoft Help also mentioned that a Picture Library has a slide view which an Asset library does not.  So my take on that is that if you want the potential of seeing your pictures as a slide show, put them in a Picture library which is still using
the 'picture' content type of previous SharePoint versions.  If you want to keep pictures organized with audio/video files, then put them into an Asset library which uses the  'image' content type derived from the new Rich Media Asset content type.
Betty Stolwyk

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