Re: "No section for Documents or Links in the Messages app on iOS 26"
Seems you only see the options for Links and Documents after you click on the contact or group icon at the top of a conversation ?
And ... 5 "If a category doesn’t appear, you didn’t receive anything of that type in this conversation."
Apple support's article for iOS 26: Share content in Messages on iPhone - Apple Support
Eg: says:
"Find all the content someone shared with you
- Go to the Messages app
on your iPhone. - Open the conversation whose content you want to see.
- Tap the contact or group icon at the top of the conversation.
- Swipe left, then tap Photos, Links, Documents, Locations, or Wallet.
- If a category doesn’t appear, you didn’t receive anything of that type in this conversation.
Note: Content only appears in Shared with You if the person who sent it is in your contacts.
You can find a Shared with You section in Photos, Safari, Music, Podcasts, and other supported apps. If you don’t want items someone sends to you to appear in those other apps, tap the contact or group icon at the top of the conversation, tap Info, then turn off Shared with You."