after updating to Mac OS 10.13 I get this file has been modified outside illustrator. do you want to continue?

We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Warm Regards,
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.
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Marcelo Soler commented
I have the same problem saving files to my desktop: each time I receive the same message. It's very annoying and wastes a lot of my time.
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Tracey commented
Same here. Upgraded to High Sierra OS. Only saving to desktop. Still get error.
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Jan commented
Upgraded to MacOS 10.13.2, then signed in to a new departmental dropbox account, then started seeing this message. I don't use the dropbox account in my work flow; .ai files are opened from and saved to the HD.
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Carol commented
Issue started this morning once I upgraded to High Sierra Version 10.13.2. I am only saving Illustrator files to my desktop. Working on an iMac (Retina 5K, 27-inch, 2017)
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Anonymous commented
I am having this issue as well. Not saving to dropbox or any cloud service - just my desktop. I am working on MacOS High Sierra Version 10.13.2 working on a Mac Mini
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Sally commented
I have been experiencing the same issue and yes I do use dropbox, but I have been using dropbox for months now and this was never an issue on previous versions of Illustrator.
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mary kate dick commented
me too. only in illustrator. no wierd plugins. illustrator 22.0.1. mac os high sierra 10.13.2
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Chuck commented
Same here, and it's driving me crazy. Photoshop is doing the same thing, except it comes up as 'Are you sure you want to replace...' dialog box. No networking. No Dropbox backup. OSX 10.13.2, AI 22.0.1
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Ian David Marsden commented
ADDITIONAL INFO: I am using various Astute plugins including Auto Save. If this might be connected.
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Ian David Marsden commented
Same issue. Files on HD. Illustrator 22.0.1 and High Sierra 10.13.2.
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Chris Phillips commented
I'm frequently seeing this problem too.
Illustrator CC2018
High Sierra
Saving to my external RAID drive -
Derek commented
Yes, I understand Adobe has never supported network drives. I got that years ago.
The "modified outside Illustrator" error is seen on external drives as well as my machines internal drive. MacBook Pro with Touch Bar 15-inch.
Nothing to do with DropBox or Google Drive. No networking involved here.
Except for Adobe's licensing servers and Typekit.
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Jackie commented
And to add to the last comment I made...With those files I have saved to Dropbox...I get the popup when I am saving even to my hard drive and not to Dropbox. Usually I save my files to hard drive AND then upload to Dropbox later from my hard drive. So I get the popup even when I'm saving only to my hard drive and not to Dropbox.
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Jackie commented
This is happening to me too. I think it must have something to do with Dropbox. I just started saving docs to Dropbox. I tested this...I worked in a doc I haven't saved to Dropbox, and it seems the popup doesn't happen. Went back to the doc that I DID save to dropbox and I DID get the popup. Even thought I logged out of Dropbox and even closed down browser. Why oh why?
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Peter commented
On a Mac, turn off "Show Icon Preview" under the "Show View Options" in the Finder for that folder or all folders. Illustrator sees the Mac OS as another program editing the file since it accesses it to render a file icon.
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Liz Hixon commented
I am having this issue almost every time I save a file. I tried restarting Illustrator and reopening the file. Once I made a change and saved, I got the error again. On very rare occasions, it will save without the error popping up.
I have autosave turned on – the error doesn't pop up for autosave, only when I manually save the file.
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ScottyC commented
Same issue. OS 10.13.2 // Illustrator CC 21.1.0
Every time I save a file. It has been open a while, Time Machine? Files are all on the hard drive. No Dropbox.
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KSDesign commented
Having this error with all locations. On Adobe CC 2018 with Mac OS High Sierra. It also happened on Sierra.
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Philip Byrne commented
Seeing this error with all files in all locations. Happens when a file has been changed and saved multiple times while still open.
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Anonymous commented
"This file has been modified outside Illustrator. Do you want to continue"
i'm recently facing the same issue too. keep received the same pop-out while try to saving each of my files:
"This file has been modified outside Illustrator. Do you want to continue"
I notice this pop-out is appear once my mac OS upgrade to Sierra high.