In phpBB 4.0, the action buttons for private messages — such as Edit, Delete, Report and Quote — disappear on smaller/responsive screens.

Cause

The responsive CSS intentionally hides the normal .post-buttons links on mobile.

For regular forum posts, this is not a problem because phpBB provides a responsive dropdown menu as a replacement.

However, ucp_pm_viewmessage.html does not include that responsive dropdown structure.

As a result, the normal buttons are hidden, but no alternative menu is shown.

Regression

This appears to be a regression compared with phpBB 3.3, where the private message action buttons remained accessible on smaller screens.

Expected behaviour

Private message actions should remain accessible on responsive/mobile view, preferably through the same responsive dropdown menu that is already used for regular forum posts.

Actual behaviour

The normal private message action buttons are hidden on mobile and no replacement menu is available.

Proposed solution

Reuse the same responsive post-button menu that phpBB 4.0 already uses for regular posts.

I tested this approach in prosilver and the responsive menu works correctly.