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
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