Lightroom: Folder synchronisation issue

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Hello, I have an issue with Lightroom 5.7 under OS X Yosemite. My catalog and my photos are located on an external drive (/Volumes/Alexandre (Bleu)/Multimédia/...). All my files are online (checked) but strangely, when I want to synchronise a folder (for example with 100 pictures inside) (because I added one picture), Lr tells me that he have to delete 100 pictures and add 100 pictures, just like he considers that my original pictures are gone. Howerer, when I want to modify parameters of my pictures inside Lr, without dynamic preview, it works and it does not report any issue regarding the location of the file. I am a bit lost... Anyone encounters this kind of behaviour?
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Alexandre PROVOST

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Posted 4 years ago

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Rob Cole

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Never experienced it, but it sure sounds like a bug.

I'm curious: if you do the sync and "delete" the 100 pictures, then re-add them, then re-sync, does it tell you you need to re-delete and re-add again? (consider making a copy of your catalog file before testing..).
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Victoria Bampton - Lightroom Queen, Champion

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Stop! Don't delete and re-add.

The most likely scenario is a change in folder name captilization somewhere along the line, or perhaps a bug with accented characters. Have you double checked the LR reported path against the Finder reported path?
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Rob Cole

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Good ideas Victoria. But also, if you make a copy of your catalog first, as I suggested in my previous post, you can *** SAFELY *** (meaning: without consequence, more-less adverse consequence) "delete" (remove from catalog) and re-add as a part of your trouble-shooting process. It could be a permanent solution, if you first save metadata, and if it solves the problem, and you don't mind losing edit history and standing in collections etc., but I was suggesting it as a diagnostic. If it does solve the problem, even if only temporarily, it means the catalog is OK, and the problem may have been due to folder case-change or whatever. If it does not solve the problem, then it means a repeatable bug which can be documented, reported, and may be due to coding of accented characters or something..

In case not obvious, after testing, restore copy and you'll be back where you were before testing.
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Victoria Bampton - Lightroom Queen, Champion

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Yeah, it's a good idea as a diagnostic. We just have to be really careful about emphasizing the need to backup and restore, as not everyone understands the repercussions of deleting files or how to save metadata to files.
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Rob Cole

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To Victoria:
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the OP was clearly computer savvy and not an Lr newb, or I would have worded/emphasized differently.

PS - I agree that saving metadata is a core skill for all Lr users to have - consider adding a few notes about saving/reading xmp to your intro book.

To OP and others:
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Barring a severely deranged Lr installation, no files will ever be deleted by synchronizing a folder - the worst that can happen is loss of develop settings and other metadata, the risk of which is mostly eliminated by pre-saving metadata and virtually non-existent if catalog backed up recently enough (right: I'm assuming you know how to do those things OR if you don't, you'll ask, OR if you don't know, don't ask, and then lose data, you'll ask next time, or, well, perhaps it's best if I stop there..
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Rob Cole

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Lr is clearly not getting the association between photo folder/files in Lr catalog, and folder/files on disk. And so the remedy will probably involve isolating aspects of paths/filenames in catalog that are different from that on disk, if such be the case, and then bring them back into harmony.

I agree with Victoria that a visual inspection is a good first step, but there are other steps which can be taken afterward if warranted - I think I'll leave it at that for now..