If the file was already downloaded, the user is asked to choose any installed 3rd party application for editing the respective file.
In case no such app is installed, editing the document is not possible.
{{Attention|The 3rd party app used for editing the file must be able to return the resulting file (in contrast to store it on the file system without telling {{UBIK}})!}}
When the editing was finished, the new file is marked as changed and will be committed automatically if Automatic Sync mode is active, else the user can commit manually.