To import new files, select the project in the project folder, and
press F5 (refresh), then you should have your new image accessible.
I had the strange thing of R file missing yesterday, too. It was
really annoying, and I tried many things (closing / opening project,
New / load existing project) that did not help.
In the end, I did:
1) Project - uncheck Build automatically
2) Build working set / select working set / select the resource
3) build manually
with a bit of luck and further playing around, R should reappear.
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