Issue Summary

In the Trello iOS app version 2026.7, image attachments on cards randomly zoom in while a user is swiping or scrolling through them in the attachment viewer. Once an image is zoomed in, it can't be zoomed out manually; the user must exit the viewer and reopen the specific image to view it normally.

Steps to Reproduce

1. Open the Trello app on an iOS device.
2. Navigate to any board and open a card containing multiple image attachments (the issue is more prominent with a higher number of attachments).
3. Tap an image to open the attachment viewer.
4. Swipe left or right to scroll through the images.
5. Observe the behaviour of the images as they transition.

Expected Results

Images should remain at their default scale (fit-to-screen) while scrolling, allowing the user to swipe through the entire gallery smoothly.

Actual Results

Random images suddenly zoom in during scrolling/swiping. The zoom persists and cannot be pinched to zoom out. The user must close the viewer and tap the image again to reset the view.

Workaround

• Use a mobile browser (e.g., Safari or Chrome) to view attachments, as the issue does not occur there.

• Exit the attachment viewer and tap directly on the affected image to view it without the random zoom.