Text-Files (*.md), created on iPhone will NOT be synced to the server

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Text-Files (*.md), created on iPhone will NOT be synced to the server (so will not reach any of the other clients (windows/mac...)

Steps to reproduce

1. Create new Text File through iPhone Editor, i.e. test.md
   (Text-Dokument erstellen)

3. Put some Text into (test.md)
4. Leave the Editor
5. Check the changed content of the file "test.md"
6. File content is consistent (changed data are there in "test.md")
7. check server content after a while
8. server content is empty ( test.md is there, but empty (0 bytes))
9. any of clients (Windows .. ) - file "test.md" is empty (0 bytes)

Expected behaviour

sync operation should be be-directional
changes in text files (*.md) by iPhone nextcloud app should sync to the server

Actual behaviour

changes in text files (*.md) by iPhone nextcloud app will NOT sync to the server

btw: photos from the iPhone Library can be uploaded to the server.
Network connection check is validated and stable (checked & verified through Wifi and 4G network !)

Logs

If applicable, you can post the iOS app or server logs (removing any sensitive information).

Reasoning or why should it be changed/implemented?

Environment data

iOS version: iOS 18.0.1

Nextcloud iOS app version: Nextcloud Hydrogen for iOS:5.5.5.0

Server operating system:

Red Hat Enterprise Linux release 8.10 (Ootpa)

Web server: : Apache/2.4.37

Database:
Mariadb (10.6.19-MariaDB)

PHP version:
PHP 8.3.12

Nextcloud version: Nextcloud version:29.0.8.1

No source files or tests are named. First reproduce the issue by creating and editing a .md file in the iPhone Editor, then compare the local file with the server copy after sync and collect the relevant iOS and server logs. Done means edited Markdown content reaches the server and other clients instead of becoming a zero-byte file.