Can't use Slope tool or others

[empty inlet]

In the video you can see it's not working

[wet gorge]

clear your selection

[empty inlet]

ok thanks

[wet gorge]

and the slope doesnt work over void iirc

[empty inlet]

ohh i saw it

how to build a ramp over it

?

[wet gorge]

freehand draw and smooth
or a path

or sculpt draw actually

or weld

or rock tool