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I've successfully installed this module: https://github.com/daylightstudio/FUEL-CMS-Blog-Module I would like to ask how can I add a post gallery for upload a list of images, thanks.
This sounds like you'll want to create a simple module that keeps track of all your photo gallery data and allows you to upload images. I would check out the following URLs to help guide you in creating a photo gallery module.
https://docs.getfuelcms.com/general/forms (for understanding which form fields to associate with your simple module like the "asset" or "file" field type for uploading images)