What are unsyncable files?
Due to some incompatibilities between various operating systems and file systems, AeroFS will not always be able to save the file to disk even though the file is synced; the file lives in a limbo state where you, as the user, cannot access it.
How to handle unsyncable files?
Fortunately, the majority of these incompatibilities are easy to solve by simply renaming the file on the computer where you see the error. Here's how:
1. A notification appears in the tray menu:
2. Click on the menu item, which will open a dialog showing you a list of files that cannot be synced along with the reason in the column called Detail.
3. Resolve each file listed based on the reason provided, and the file should show up on your disk immediately. Below are a list of reasons that you may see and how to resolve them:
AeroFS has found two filenames that only differ by case. For example, "Hello" and "hello" on Linux are two different files, and on Windows and OSX, it's the same file. This wreaks havoc on syncing and we recommend that you rename the file.
"Filename too long"
All file systems has a limit on how long a filename can be. Please shorten the filename to resolve the issue.
A filename is not valid if it contains certain characters. OSX and Linux accepts just about anything, Windows doesn't like a long list of characters (found here). Renaming the file will resolve the issue.
Windows disallows certain filenames for legacy support reasons, here are the details:
http://msdn.microsoft.com/en-us/library/aa365247(VS.85).aspx. You can also resolve this by renaming the file.
"Trailing space or period"
Delete the trailing space or period to resolve.
"Lack of permission or disk error"
Please make sure you have read/write permission to the folder where you want to save the file. You can also check to see whether you can save anything else to your disk. A number of other resources online can help resolve disk errors, starting with: