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Greeting David. Hoping all is well for you during this interesting era.
I’ve read through the docs, seems ITPC maps either upon upload or has to be done manually. Been attempting to get images to update their title based on caption. In IPTC/EXIF the title field has a EXIF/template value of template:([+post_excerpt+]). A few things worth noting:
1. “Enable IPTC/EXIF Mapping when updating media metadata”, “Enable IPTC/EXIF Mapping”, and “Enable IPTC/EXIF Mapping when adding new media” is checked ON.
2. After uploading image(s) when editing the caption and/or title, the mapping template doesn’t update the image title. It would seem “Enable IPTC/EXIF Mapping when updating media metadata” option is ignored when updating media information?
3. When using “Bulk Edit Media” followed by clicking Map IPCT/EXIF metadata it updates all selected images so that titles are replaced by captions from the IPTC/EXIF rule. Same thing for IPTC/EXIF tab > Title > Execute. I’m pleased this works perfectly. The reason this is problematic though is that as a site admin I’d have to execute it manually for site users often, Image URLs can break, and users would only see the new titles once manually mapped. Automatically assigning the template rule on image update would solve this. Using CSS could then hide the title field so that users focus their attention on the caption field for good SEO.
WordPress by default shows the caption field instead of title field when creating a gallery after selection is made. As a result it’s far easier for users to add captions than it is to add titles, especially when uploading hundreds of images. Would be unfortunate to have blank titles when users go through the trouble of adding captions for each image.