Can you upgrade a room to merge it?

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I have a room that I upgraded, not realizing that it had space next to it. I tried to merge it with a new room, but it didn't work. If I upgrade the one-off room, will it merge with the existing room?
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Can you merge upgraded rooms fallout shelter?
In fallout shelter, on android, one of the objectives that may come up is to completely merge four rooms. However, as stated in this question, you can only merge a maximum of three rooms together....Can pets have babies in Fallout Shelter?BreedBoxerLegendary Bonus+36-45%3 more rowsHow do I merge 3 fully upgraded rooms?
There are a total of 23 available room types that when built begin at level 1 and can be upgraded with caps to a maximum of level 3. Most rooms can also be merged up to three times by placing an identical room of the same tier next to it. Generally, each room can facilitate two dwellers.How many rooms can you merge?
In fallout shelter, on android, one of the objectives that may come up is to completely merge four rooms. However, as stated in this question, you can only merge a maximum of three rooms together.Rainbow Room ~ Merge of Equals
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