When you're making the maps, in the objects bit where it has the object groups such as MyTrees, Myrocks, and any other group of objects you have downloaded, you will need to send these files.
If you modified the sky and such, you will need to send this file and the weather file.
And of course you need to send the map file.
For example, if I have a map called Examplemap. With the objects groups My Trees, My rocks, plants, house objects. You will need to go into your exports and find the files called:
Examplemap.fhm
MyTrees.fho
Myrocks.fho
plants.fho
houseobjects.fho
And yeah. you get the point. ;P If the objects aren't showing up to your friend, tell them to put the object files in Objects folder (Which is located in Media, in your feralheart folder) and that /should/ work. to make a zip file, right click and click new> Compressed (Zip) file or something like that
Hope you understood me okay. x3 Sorry if I'm no help but yeah xD