Started receiving this error message as well. Seems to be hit and miss.

We started getting this erroneous message most of the time now after updating to v30. Files are on a network share, but it was not a problem before.

Also started to receive this message with upgrade to 30.0 on Windows 11. Mapped network drive in Windows is to SMB share on a NAS on a LAN; I have been using same configuration of workstation and NAS with Illustrator for years without receiving this message. Both machines successfully sync time regularly with a local timeserver on the LAN.

Edit adding: it's not every file. For instance: two files open on same share, one saves changes normally, the other gives me the message with every change. If I find a pattern, I'll post it here. Save and reload the "problem" file, then seems to save normally. Then another file which was saving fine starts to show the message...

These files are on a network. I haven't experienced this issue until the install of the new Illustrator 30.0. I'm running Windows 11 Pro, v. 10.0.26100.

Erik, where is this file located?
Is it a file from a cloud-managed folder? A network folder? A NAS folder?

Upon installing Illustrator 30.0, I keep getting a message popping up when saving a file that says "This file has been modified outside of Illustrator..." None of the files have been modified outside of Illustrator to cause this message.

Hello Egor, all the data that is being processed is located on a NAS drive.

Andreas, where is this file located? One a local drive or a over a network? Is the folder cloud-managed?
Please share more details about it.

Bugs after bugs
Every time I save a file while working in Illustrator, I get the message:
This file has been modified outside of Illustrator. Do you want to continue? The problem occurred after updating to version 30.0.
(PC, WIN11)
Language in the screenshot is German

still happening in 29.5.1

There needs to be a way to disable this warning message. I have only seen this error in Illustrator, and it has been around for over 15 years with no solid solution. It appears to be related to file timestamps, but when a user is working on a file, saved on a file server, and they are the ONLY one who has access to the file, this error should NEVER appear. This error appears for Windows or Mac users, saving files on either a network or cloud storage location. So far, Adobe's solution is "just save the file locally". This is not a solution. There are many reasons files are not stored locally.
It would be best to have the option to disable this file check Adobe is doing. It does not help anyone.

Hi Egor, the Synology NAS acts like a personal cloud service with the service "Synology Drive". You have local folders that get synced with your NAS but it doesn't matter if the NAS is local or remote.

And for services like that Apple has an API and my theory is that Illustrator file handling doesn't work well with this API.

Oh. For some reason I thought of a drive as a drive, since you mentioned NAS, and not as a cloud syncing solution... but you said it then doesn’t get synced with on your LOCAL NAS, didn’t you? So it it is a network share, or I (being a Windows user), don’t understand something about MacOS?

Hi Egor, the articles in your comment refer to using Ai over a network share via SMB or AFP. I am using Synology Drive (https://www.synology.com/en-us/dsm/feature/drive). This is comparable to Dropbox or Google Drive. The files are local and they get synced.

Yep, Ai is just not playing nice with removable drives and networks in general.
According to the manual (https://helpx.adobe.com/illustrator/kb/illustrator-support-networks-removable-media.html), 'Illustrator does not support network or removable drives as scratch disks, or folders of file sync services such as Dropbox, Google Drive, and icloud’

Also mentioned in several other places:
https://community.adobe.com/t5/illustrator-discussions/ilustrator-file-will-not-save-on-nas/m-p/14041745
https://www.reddit.com/r/synology/comments/som6f1/synology_not_playing_nice_with_mac_chrome_and/
The last one also suggests tweaking permissions on MacOS, please consider trying it. Would be nice to hear back from you on the result.

When I'm saving an Illustrator doc to a Synology Drive folder it almost always says, that the file has been changed outside of Illustrator which it hasn't. Finally after saving and closing it, it hasn't synced with the Synology NAS and I have to manually tell it to upload.

This only happens with Illustrator and Illustrator files. All other programs handle it well. It's seems that there is a proplem with Illustrator and the file provider API from Apple, judging on reports from others with different file provider services.

plz fix this

Still happening in version 28.5.

December 2023, and I just got this warning - again. I do not work off of a remote server, but I do tend to get this warning after I've saved a copy. While editing my designs, I save out PDFs of versions that I send to clients. The only work-around that I've developed is that I have to do a "save as". I save the file with a new name, (close the file and re-open the new one) and it will generally work.

Happening October 2023 for Illustrator 28.0 on Windows 10, so this is not Mac-exclusive. It does seem to be related to what drives items are saved on - my files are in a network drive shared by other team members but have not been opened/edited/looked at by anyone else. It will usually give me this prompt only if I'm saving a file I've already had open/saved a couple times already.