How were these TIF files created, the ones that Lightroom is creating JPEG images as well? This doesn't sound right. I have never encountered such a procedure with Lightroom.
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On import of any image file type LR does not Auto create a second file and certainly not a JPG for an imported TIFF file.
It will make a second copy of the imported file if you have that option checked but it would just make a copy of the original file type and not convert it to a JPG file.
What are the exact settings you are using during the import. Are these TIFF files already stored on the hard drives either internally or externally connected to your system?
Please post a screen shot of the import dialog window with all the options shown that you are using.
Are you using the Move, Copy or Add option in the import dialog window?
What type of computer are you using and what is the exact OS version installed?
I've been trying to recreate the issue but I haven't been successful (reimported the entire library I was working on and no duplicates), which means this was either some sort of fluke or I did something that escaped my attention somehow. I'm working with +50,000 files so I suppose thats possible, they are not all under one catalog as my laptop (a 3 year old Mac Book Pro, running macOS Sierra) cant handle it.
Do you think its possible I broke LR? I don't ask it to handle catalogs with files over 20,000 at any one time. My import settings do not include making a copy, I was moving files into subfolders on my internal harddrive. Those duplicated JPGs seem to act like preview files (they don't show up in library view in LR, but the copies are in finder). The TIFF files are created by an iPhone camera, imported into LR via combinations of direct imports from the device and backups downloaded from external drives.
I've given up trying to figure out why any files were duplicated at all since I haven't had that happen again, but I've attached my import settings (I'm using MOVE) can you confirm with settings like these there should be no duplication of files?
I don't own an iPhone so I have no idea how you are capturing TIFF files from it. I read that some add on camera app can do that.
Could be you had it set to capture both TIFF and JPG or it was a glitch in the software that did that. Or those JPGs you saw were some type of sidecar file created by the camera app