Use APKPure App
Get Floatin - (Floating Image) old version APK for Android
Useful And Simple Pop-up Image Viewer
You can float your image on screen.
It'll work just like the window on desktop.
You can use this app variously on life.
Copying phone number... Making Hearthstone deck...refer to something....
This app is get along with screenshot function
Guide Video: https://youtu.be/0Bt3cGa-bYE