Yes, that is what it most often means. But it also means that you did preserve 
the notes in the separate .skim files, so you can just get them by answering 
YES. (You can suppress the dialog by setting a hidden preferences, see the Wiki 
for details).

Christiaan

> On 18 Jan 2023, at 11:24, Mark Roberts <mroberts1...@gmail.com> wrote:
> 
> I have had some similar issues when moving PDF and Skim files between 
> computers. It sounds like it might(?) be because the file attributes were not 
> preserved.
> 
> The symptom is that when I open xyz,pdf from mac A on mac B, I get an error 
> message:
> 
>      Unable to read notes for xyz.pdf, but a Skim notes file with the same 
> name was found. Do you want Skim to read notes from this file?
> 
> Does this error mean the file attributes could not be found?
> 
> TIA
> 
> On Tue, Jan 17, 2023 at 12:25 AM Christiaan Hofman <cmhof...@gmail.com 
> <mailto:cmhof...@gmail.com>> wrote:
> The extended attributes are file attributes. It depends on the file system 
> implementation exactly where they are saved, that cannot be controlled. It is 
> not a question of “saving in DropBox” (DropBox is not a location), but rather 
> whether DropBox copies the attributes (which nit doesn’t). Attributes are not 
> like separate files, so “save it in another folder” does not make sense. BTW, 
> in the current default format iCloud should preserve the Skim note attributes.
> 
> Christiaan
> 
> > On 16 Jan 2023, at 16:09, Stéphane Coudé <stephane.co...@gmail.com 
> > <mailto:stephane.co...@gmail.com>> wrote:
> > 
> > Dear Thomas and Christiaan, thanks for you help !!!
> > 
> > Actually, by activating the .skim file in the general setting (it was 
> > activated by default in the former version of SKIM) I solved my problem. 
> > Since the .skim file is saved at the same location as my .pdf file, which 
> > is in my Dropbox, both files are now saved on both computers. I just have 
> > to ensure that once I have finished working from one computer that I close 
> > the file. Then when I reopen it on my other computer, SKIM automatically 
> > detects that there is a .skim file related to my document and ask me if I 
> > want to integrate the notes from the .skim file. That way, I have access to 
> > my notes on both computers and I can update and modify them from both 
> > computers.
> > 
> > Just a curiosity Christiaan, you are probably right about the fact that 
> > Dropbox doesn’t synchronize the extended attribute of the pdf files. It may 
> > be all depends on where that information is saved. Is there a way I can 
> > save such information in my Dropbox ? In other words, where is the extended 
> > attributes of the file are saved ? And can we decide to save it in another 
> > folder (that could be on my Dropbox as an example) ?
> > 
> > Many thanks again,
> > 
> > Stephane
> > 
> >> Le 16 janv. 2023 à 04:36, Christiaan Hofman <cmhof...@gmail.com 
> >> <mailto:cmhof...@gmail.com>> a écrit :
> >> 
> >> 
> >> 
> >>> On 16 Jan 2023, at 02:07, Stéphane Coudé <stephane.co...@gmail.com 
> >>> <mailto:stephane.co...@gmail.com>> wrote:
> >>> 
> >>> Hi,
> >>> 
> >>> I have a desktop computer and a laptop (both recent Apple products 
> >>> purchased in 2022) and work on the same document from both computers. I 
> >>> have installed SKIM on both computers. But I recently have to work on a 
> >>> large document (more than 200 pages) and I have had the following problem 
> >>> :
> >>> 
> >>> If I annotate my file with SKIM from my desktop computer, when I open the 
> >>> same document on my laptop, I cannot see my annotation anymore ???
> >>> My documents are saved and synchronized with Dropbox.
> >>> 
> >>> I have been using SKIM for almost 10 years (great product by the way) on 
> >>> my previous computers, always with a desktop and a laptop computer for 
> >>> scientific reading annotation as well as scientific article review but 
> >>> not much during the last three years. Previously (I don’t remember from 
> >>> which version this change happened), every time I was creating annotation 
> >>> with SKIM on a document, it was creating a « .skim » file beside my 
> >>> original file. Therefore, it was easy to find my notes and to see it from 
> >>> any of my computers or even when I change computer. Considering the 
> >>> problem I have now by restarting doing such kind of work, I am concerned 
> >>> about that issue because when I will change my computers in the future, 
> >>> is that mean I will lose all my SKIM work ?
> >>> 
> >>> Is anyone can please help me with that issue ?
> >>> 
> >>> Thanks in advance,
> >>> 
> >>> Stephane
> >> 
> >> DropBox (probably) does not synchronize the extended attributes of the 
> >> files, where we save the Skim notes. So this will not work. You could 
> >> either save your PDFs as PDF bundles, which should synchronize them 
> >> properly. Or you can always save a .skim file backup of the notes (you can 
> >> set this in the General preferences), and synchronize that with the PDF. 
> >> (But be aware that changing notes on both systems may b=not be seen on the 
> >> other when you do this). Our you can synchronize files with embedded 
> >> notes, but that has other problems. See also the FAQ on the Wiki.
> >> 
> >> Christiaan
> 

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