lets see how do i reply to comments on a question, i hope this was the right button because i never actually used stackoverflow alike websites.
Well the Covers do Import and Export as in they take from whatever is Imported, and then they put it where it needs to be exported. And if there is nowhere to be exported it will dump it into the Storage, while if there is nothing to be imported it will try to take from Storage.
Filtered and Semifiltered only matters for the order of execution, and you can manually set priority using the Screwdriver on those Covers.
Stuff will generally try to Import from the Lowest Priority first and Export that to the highest priority first.
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