3D shp import

 Hi ,


i tried to import a polygon that i did draw, i want to use that polygon to calcule the volume from however it says that the polygon must be in 3d. How can fix this?



When I export a volume as .shp from the software:

I get these outputs: 

When I try to import a volume I see: 

If I select the vertices only, I get this error message: 
Selecting the surface object solves this issue. 

I would suggest to compare the shapefile you have created with the one you can export from the volumes tool, to see if they have the same format. 

Let us know how this went!