In Co-Op, only use if you are the host, and you have no extra cabins on your map (because they will be removed).
After the import is done, you can build your cabins and go on as normal.
Allows the import of plans that you or others build using the planner on stardew.info.
You can now import farms without exporting them first by using the id set on stardew.info.
For exp. this plan: https://stardew.info/planner/evil-impala-82/ would be imported by typing into the smapi console:
this will also create an import file in your folder, so it doesn't have to download the content again
if you however want to perform a new download and not use the cached file type:
You have to be on a location somewhere other than the Farm to import. Make sure only to import plans suitable to your farm-type.