It would be great to be able to change the file name within the ImageGallery, like you can in the "Files and Images" section of the CMS.
I'm having to go back and forth. First, I have go to the ImageGallery page to see what the pics looks like, jot down the original name, then I have to go Files and Images to change the name to make it more search engine friendly. It would great if I or someone else accessing the CMS could do that in one step -- see image, change title, caption,
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The issue with the filenames is that you're not editing files in the ImageGallery page. You're editing image-containing dataobjects. The File itself is edited elsewhere. Are your filenames arbitrary? If they adhere to a pattern or convention, just use an onAfterWrite() function in your Item class.