To download someone else’s story on Instagram, you will need to either screensho/screen record the story, or use third-party tools, as the “Save” option from the settings will not be available. Most of the third-party tools will require you to input a link to the story, or enter the username of the person whose story you want to download. Once you provide the username, the downloader retrieves the public story, and you can then download it to your device. Some IG story downloader tools additionally let you save stories from private accounts, but only in the case when you are following the user and have access to the source link of story or post in question.