New user here, so apologies for what I am sure is a very obvious problem!
In the Omeka website that I have created (https://spacesofinternationalism.omeka.net), each exhibit contains a series of thumbnail images that link to the various pages within that exhibit. I have used the ‘square thumbnail’ direct link for the relevant item (i.e. a chosen item from the page) to create these thumbnails. However, every so often the thumbnail images expire, leaving only an ugly text link to the pages in place of the intended thumbnail link.
Do you know how I can avoid this happening? All advice much appreciated!