I don't know how and I'm pretty sure it's such a simple process I was just wanting to know because I was planning on creating something to post.
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You'll want to use the website to upload items to the Creation page. Below are the necessary steps you'll want to take. 1. Load up Bungie.net 2. Select Community -> Creations 3. Near the top right will be a "Submit a Creation" button. 4. There you'll have room for a Link, Title and a Description. Once you hit submit, a Bungie Employee will need to manually approve your creation. Until then, it will appear as "Not found" on your profile. More information: https://www.bungie.net/en/Help/Article/44415