For the past few weeks, while I'm using Illustrator and go to open a new document, I get the above message. Often, when the documents window opens, I can see all my cloud documents, then after a second, they disappear and it says "can't open cloud documents". I can go to creative cloud and open them there. Sometimes if I restart Illustrator, they're there when I reopen the program but only about half of the time, and that isn't a great fix anyway since I often have a few documents open at a time while working and don't want to have to close and reopen Illustrator multiple times during the day. Illustrator & creative cloud are both up to date, creative cloud is online, and I'm working on a 2015 macbook pro running Big Sur.
Unbless you 100% need to use the cloud, I would use the safer more reliable route of storing locally, then backing up to a cloud if you need these documents shared or access to from any random computer.
I am sorry to hear about your experience. Would you mind sharing a few more details like:
The exact version of macOS & Illustrator
Are there any recent changes made to your system? For example, any antivirus, system updates, plugins, or web extensions installed recently.
Do you use a proxy or VPN?
Have you clean reinstall the Illustrator & Creative Cloud app?
Also, I would request you to perform the following steps in order:
Reset Illustrator preference manually: Close all Adobe applications, and then go to the following locations:- ~/Library/Caches ~/Library/Application Support/Adobe ~/Library/Preferences Rename Adobe Illustrator, com.adobe.illustrator and Adobe Illustrator 26 Settings folders to Adobe Illustrator.old, com.adobe.illustrator.old and Adobe Illustrator 26 Settings.old
Note: Location starting with this "~" sign indicates the User Library, which is hidden. So, you need to copy & paste the exact path in spotlight search or from Finder Menu > Go > Go to Folder > Paste the location in the dialog box like this:
Disclaimer: Please note that renaming preferences folders will remove all the custom settings, and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. The location is mentioned above.
Go to the following location and delete all the files & folders inside it: ~Library/Application Support/Adobe/OOBE
Rename the CEP folder to CEP.old from the following location: /Library/Application Support/Adobe
Rename the UXP folder to UXP.old from the following locations: /Library/Application Support/Adobe ~/Library/Application Support/Adobe
Launch the app from the Creative Cloud Desktop app and share your observation with us.