Certain filename disappears in Vault.

[3735943886]

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Summary

Certain filename disappears in Vault.

What software is involved?

• Operating System: Windows 10, iOS 15.1
• Cryptomator: 1.6.3(Windows) 1.6.1(iOS)
• Vault is under OneDrive Business

Volume Type

Dokany

Steps to Reproduce

1. Create document file named "Dynamic 18F-FPCIT PET Quantification of Parkinson Disease Metabolic Networks and Nigrostriatal Dopaminergic Dysfunction in a Single Imaging Session.docx" in Vault.
2. Lock Vault and unlock again. (Or just wait some time without locking/unlocking vault)

Expected Behavior

The file should be there.

Actual Behavior

The file disappeared on both Windows and iOS client.
But when I tried recreating it (I tried with "copy con" in attached screenshot), it appeared again immediately.

Reproducibility

Always

Relevant Log Output

No response

Anything else?

[overheadhunter]

Since this is most likely length-related, can you please look up two values:

1. If you open the vault.cryptomator file with a text editor and decode its contents (e.g. using jwt.io) (it doesn't contain secrets), there should be a value in the second block called "shorteningThreshold", which is usually 220. Can you confirm this?
2. If you open %APPDATA%\Cryptomator\settings.json. For each vault you have, there is one block of data containing a value named maxCleartextFilenameLength. Can you tell us what this value is for the block that corresponds with your vault in question (you should be able to identify it using its path or displayName attribute)

[3735943886]

Thank you for answer.

I checked and decoded the file vault.cryptomator, the value of "shorteningThreshold" was 220.
I do not know how to open %APPDATA%\Cryptomator\settings.json on iOS client, but "maxCleartextFilenameLength" was 2147483647 on Windows client.

Full path of problematic file was H:\personal_data\degree\2021-2\임상핵의학\Dynamic 18F-FPCIT PET Quantification of Parkinson Disease Metabolic Networks and Nigrostriatal Dopaminergic Dysfunction in a Single Imaging Session.docx and it was counted as 190 characters, however it might be longer bytes because it has some multibyte Korean characters in middle of path.

I tested long file name such as "aa.......aaa" and it also disappeared as expected, but I'm just wondering why it was shown OK when it was just created and eventually disappeared as time goes on.
And how can I use long filename without problem?

[infeo]

Depends on cryptomator/cryptofs#121 and an update of cryptofs

[infeo]

For users affected by this issue: Update to 1.6.5, run the Vault Health Check tool and fix all warnings with the description "org.cryptomator.health.shortend.TrailingBytesInNameFile...".