Unable to save odt file

ONLYOFFICE Mobile:
With the mobile application, it is not possible to save .odt files. The file opens and allows you to edit it, but once you save it, a new .docx file is created without notifying the user. I saw that the list of supported files says that this is how it is supposed to work, but it does not make sense. Furthermore, you can edit them normally in the PC version, so why not on mobile?

OS version: Android 15
App version: 9.0.4

Hello @Benutzer
We always recommend converting .odt to OOXML format before the editing process since this format is native for ONLYOFFICE: Opening file | ONLYOFFICE
If you face any issues saving .odt file in the desktop app, we would suggest converting it first to ensure format compatibility.