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: Upload the images to Instagram in reverse order (Post #3 first, then #2, then #1) so they appear correctly from left to right on your grid.

If you are looking to create a striking three-post grid header for a brand or personal profile: 3rdGSBBrnrar

: Click the three dots on each post and select "Pin to your profile" to lock the banner at the top of your feed. : Upload the images to Instagram in reverse

Option 2: The "3rd Banner" (Genshin Impact / Honkai: Star Rail) 3rdGSBBrnrar

Below are posts tailored to the most likely interpretations of your request: Option 1: The "3-Part Seamless Instagram Banner"