Photos and videos not displaying in Messages app on iPhone

I got a new iPhone 17 earlier this week and updated to the latest iOS (26.1). If I go into the Messages app, choose a conversation, and choose the Photos tab, I can see the pages of small versions of the images in rows of 3. However, if I select one past the first four screens or so, I only get the word "photo" with a harvey ball. Image is attached below. This is also the case for all of my conversations. I also can't see videos - I just get the word "video" with an icon of a video camera and "MOV" with a harvey ball. I turned off and restarted my phone - that got me access to a few photos but mostly did not help. How can I regain access to these photos and videos that were shared with me via Messages? Thank you.