Try these in order. Tests 3, 4 and 5 may take you out of Instagram — that is what they are checking. Come back here afterwards and note what happened.

Test 1 — copy the picture

If this works you could paste it straight into a message or a post, without leaving Instagram.

not tried

Then open any chat and long-press the message box — is there a Paste that puts a picture in?

Test 2 — the picture, big

A screenshot of this would at least be something. Tap to fill the screen.

not tried

Test 3 — open in Chrome (method A)

not tried — did Chrome open?

Test 4 — open in Chrome (method B)

not tried — did Chrome open?

Test 5 — new window

not tried — where did it open?

Test 6 — show the picture on its own

Replaces this page with just the image. Use the back arrow to return.

not tried