[Plugin: NextGen Gallery] Refresh metadata from img file

Hi all,

I’m new to wordpress and html in general. I have a page with a NextGen gallery on it. Each of the imported images has some IPTC caption data stored in the file itself, so when I initially import them into my gallery, the captions are also initially imported. This is great, however, what I want is to be able to overwrite the image file directly on my file system (in \wordpress\wp-content\gallery\<galleryname>) instead of deleting the file in the wordpress interface and reuploading it. Then, I want to be able to refresh whatever metadata is on this new version of the file automatically. Currently, if I replace the image on the filesystem, the metadata stays the same because I guess it is stored in some database. Is there anyway I can refresh the metadata from the new version of the file?

Thanks.