Your GTX 1070 is a 1440p card, but Frosty mods can eat VRAM. Follow this rule:
Frosty Mod Manager is notoriously finicky. frosty mod manager 1070 portable
The mod will move to the "Applied Mods" list in the right-hand pane. Your GTX 1070 is a 1440p card, but Frosty mods can eat VRAM