There is dependency in composer.json as "intervention/image": "^2.4|^3.4",, but there was changes in 3 version, such as exclude Laravel support to another package
So, when you install laravel-imageup, you have an error Class "Intervention\Image\Facades\Image" not found
To fix this, you need to hardcode version 2 in your composer.json:
"qcod/laravel-imageup": "^1.2",
"intervention/image": "2.4.*",
I think it will be good to remove 3.4 version from composer, while support for it not added