RGB combination of Jupiter

I have taken images in RGB using FireCapture. When I use the channel combination function to combine these images, there are no choices to load, even though I have loaded them on the desktop. I can't draga and drop them either. I thought they might need to be in xisf format, so I saved then that way and the same issue is there. I must be missing something basic. Does anyone have an idea or seen this before? Thanks.
 
could be that the files are not mono but grey RGB files? ChannelCombination requires mono (1-plane) images.
 
That was it. I don't know why a mono camera would take RGB photos, but that is what happened. WHen I convereted them to grey images, it worked fine. Thanks,.
 
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