Unhappy [Q] Problems uploading photos to instagram

Regardless of how I hold the camera on my lg g2, the photos are always sideways when I try to upload them to instagram. It is SO frustrating. I've tried editing and flipping them in other directions and then uploading them with no success. I've also tried changing the camera settings. When I view them in my photos, they're upright but as soon as I try uploading them to instagram they're thumbnail sized and sideways. Any advice?