Use APKPure App
Get Wallpapers Macro 4K old version APK for Android
UHD backgrounds macro, click the "save in 4K"
Various backgrounds macro in 4K UHD. Insect Flower and other.
After choosing the image and clicking the button "save in 4K" image will be available in your gallery.
All photos are with License: CC0 Public Domain License, or Creative Common license.