You can open your presentation files out of your GMX keyword keyref="file-storage"
Note, that only the following file formats are
supported for presentations: .ppt, .pptx, .odp.
The file management for Online Office is solely done in your GMX File Storage. If
you want to open and edit locally stored files in Online Office,
they need to be uploaded to your GMX File Storage prior to that.
This applies to e-mail file attachments as well. They can be opened and edited in
Online Office after being stored in your GMX File Storage.
In the Open file section, click From File Storage.
The dialog Open File in Editor will open.
Navigate to the folder, where the file is stored.
Check the box next to the file or click on the file itself to select it and