@Alexey I have tested following browsers on Android 7,8,12.

Dolphin, Brave, Opera, Chrome, Firefox.

Only Firefox works in search in messenger giphy. The noticeable difference is Firefox, the keyboard "enter" key remains the enter, where in all other browsers it changes to "next" and pressing it takes me to the input of a message and giphy doesn't repopulate.

Also, wouldn't it be easy enough to just have the popup for giphy display the attribution image underneath the scoller?