Instagram on iPhone 12 pro. Older multi-photo posts.

Instagram on my new iPhone 12 pro: When I look back at older posts only the first photo shows of a multi-photo post. When I swipe left to see the other photos, I get a circular arrow on a white background. When I click on the arrow the photos and videos do not load. All older posts that are just a video, they do not play. It works perfectly on my laptop, but not on the phone. And when I say older posts, I mean a few weeks ago.

Thank you for any suggestions.