I do all my post work on a desktop workstation, but I shoot tethered to a laptop, to which I only import jpegs for reasons of speed and storage (the image pops up immediately, and I don't have to constantly trash all the RAWs to save HD space). Once I'm ready to import, I have no further use for the jpegs. I can't even imagine a reason I'd want to bring them into Lightroom.
There is no way to do this in Lightroom's import interface, and I guess there never will be, and I'd made my peace with that, until Lightroom learned a new trick recently.
Several imports in a row now, Lightroom has imported the RAW and the jpeg for most of the card, but skips the RAW for several images and only brings in the jpeg. This is not immediately apparent, as you can imagine. Fortunately, I've caught it every time but once before formatting the card, and been able to import the missing RAWs manually. Once, I'd already formatted the card but was able to find the missing files with Photorescue.
It's just all the more infuriating because it wouldn't even be an issue except for that one stupid omission in the import dialogue. I can't even threaten to "take my business elsewhere", because even if I switch to Capture One, I'm still paying for two Creative Cloud subscriptions (long story; one computer too many in my workflow).
I can only hope this is just a bug that will be squashed before the excruciating workarounds age me prematurely. More.
Right now, only work around is drag and copy files instead of using importer as this unfortunate lottery of missing RAW tend to work on file I often need to work on :(
After trashing preferences, we made one successful import and he declared the problem solved. Of course it began acting up again (importing JPEG only for 38 of 81 images - nearly half the shoot!).
If I check "treat jpeg..." and manually deselect all the JPEGS, so all RAW is selected and all JPEG are unselected, it still imports JPEGs only for a randomly selected group of images. the Adobe representative witnessed this himself and tried to sidestep it; first saying it was expected behavior, then that it was a known issue. Finally, he basically blamed me for wanting to do such a strange thing as not import JPEGS I had no earthly use for.
First though, he insisted that there was a way to import RAW only, not believing me that I'd looked it up and it's well documented that you can't. He tried several different ways before, shocked and bewildered, finally admitting I was right. At least someone at Adobe admits that it's a bizarre UI omission.
Drag and copy works for me too, or manually deleting the JPEGS off the card before I import, but what a ridiculous workaround. Especially since it would be moot if only we were allowed to filter by file type.
Lightroom is not living up to one of its core functions: to make photo management easy and foolproof.
Can I confirm which OS you're on, and which LR update? And what camera? The reason I ask is I had an oddity a couple of months back, and it turned out to be macOS that was missing files! So I just want to rule that out for a start.
(And yes, filtering to just import raw files is a solid request I've heard before too.)
Adobe should consider adding a feature that allows me to import all the RAW images off a card without randomly skipping some and replacing with JPEG. Perhaps most users enjoy the thrill of suspense, wondering which of their images will be imported as RAW and which as JPEG.
Unfortunately I'm old and set in my ways. I have distinct UI expectations that I can't let go of, prejudicial though they may be.
What camera model?
What LR version?
Are both cards in the camera at the same time and the camera decides how to put the images on each card, or are you switching cards mid-shoot?
Are the images only raw aside from any camera-created HDRs or Panoramas which would be JPG, or are some image raw+jpg (as the title for this thread suggests the problem is about)?
If raw+jpg are the raws on one card and the jpgs on the other card?
Is one card a backup of the other so each has the same set of images?
Are both cards the same kind, like both Compact Flash or both SDXC or are they different types of media? If the same type is one larger than the other like a 64GB and a 128GB?
Do both cards have the same volume label, like EOS DIGITAL or similar, or do you name the CARD1 and CARD2 or something else unique?
Do the images on each card have the same sequence of numbers because each card starts number it's images with 0001, again? Or do the images sequence numbers continue increasing from one card to the next? Is the first image from the shoot 0001 or does it just start wherever the previous shoot left off?
In your post you say you eject the first card when the import and 1:1 preview creation are finished. Is this true, or is just the import finished, but the 1:1 preview creation still occurring for the first set of images?
As at least one other post asks people to do, after you've inserted the first card and still are on the Import screen, do you wait there until the card scanning has found all the thumbnails or are you clicking Import before all the images on the card have been scanned for?