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I'm having trouble upgrading my map room. It wouldn't let me upgrade it. I thought it might have been because it was on the edge and there was a plant nearby but I moved the map room so it was isolated with cells all around it, and I do have the resources, but it still won't let me build it. It just beeps at me. I added an image to show the cells are empty and what it looks like when I try to upgrade.  

(+1)

The red areas require more of the same type of room when upgrading

Ahh, thank you! Much appreciated. 

Glad to hear you're sorted :)

If it's helpful to know, this is also covered under the "Gameplay tips" section here on the store page above, and will be included in-game in the planned "beepedia".