Click on Floor plans in left panel

Click on + Upload map

Select Files to upload or Drag and drop file into the upload window

You can adjust the picture

Click on Upload
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Click on Buildings in left pane and choose the building you want to update with the floor plans

Go to the tab Floors

Choose the floor from the tab

Click on Upload map (you can upload a new map or select from existing map)

Select files to upload or drag and drop files.

Make sure to Save

Go to the tab Floor map

Select a shape (choose between oval, square or custom)

Draw the space & resource in the map

You can change the parameters in the details pane

Don't forget to Save