You have to also share the .fho files to get the objects to show up. Sometimes when you export your map you'll notice a few other files like .fho, .fhs, fhw additional to the .fhm. You have to upload/share all of the files exported for your map to fully work ^^ Your .fho folder will be the names of the object groups you use.
For example, if you exported a map called, I dunno, "BerryLand" and notice a few new files such as
berryland.fhm
MyRocks.fho
lolcoolsky.fhs
weather.fhw
in your exports folder, you have to send all of them.
And to make a .rar or .zip folder select the folders or files you want compressed and right click, then choose "Add to archive".