Thanks, I had tried both and in my frustration wrote the wrong way in the post as I got caught in a web of trying multiple things. I appreciate your clarity.
But, unfortunately, it still is not working. Does size only work with file?
Here is what I have in the text box of the simple page:
An experimental documentary which chronicles the process of artist Roseman, Harry’s “Woven Walls” drawing installation in Woodstock, NY in the summer of 2008. Selected by Vassar College’s “ModFest” in 2010.
“In Omeka, shortcodes work in basic text fields (not using the HTML editor) in specific places on Omeka Classic sites: on Simple Pages, and on Exhibit pages.”
Not sure why they are not working unless size=square_thumbnail or size=thumbnail cannot be used unless it is [file id=#]
There isn’t a “size” option for the “items” shortcode: it just uses your theme’s items/single.php view (the same that’s used for displaying featured items on the homepage).
You can edit that single.php file and change what it shows, including the thumbnail type. Also, enabling the “Use Square Thumbnails” option in the Appearance settings will cause square thumbnails to be used here (and in several other places).