Failure to send a document to an already running BBB meeting

[ZID-TU-Graz-Collab]

Describe the bug
Failure to send a document from Nextcloud file browser to an already running BBB meeting.

To Reproduce
Steps to reproduce the behavior:

1. Start a BBB meeting by clicking the Nextcloud main menu (the symbol at the top left of the screen) and then "BBB".
2. Click on "Room name", type "test meeting" as a name for the room and click the button "Create"
3. Click "the button "Start"
4. Wait for BBB to load and join the meeting either with or without microphone.
5. Switch back to the browser window or tab showing Nextcloud.
6. Click the main menu again, and select the file browser with the "Files" button.
7. Find a suitable file (i.e. PDF or other BBB compatible office document.)
8. In the context menu of the file ("...") select "Send to BBB"
9. In the popup with the headline "Send file to BBB" click the button "Send to" test meeting

Expected behavior
The file thus selected and sent to BBB does nothing visible. There is no error, but also no other visible reaction.

If the meeting is NOT already running, but gets started with the sending of the file to BBB everything works. The problem seems to be limited to already running meetings, but the more important scenario, to send a file to a running meeting, does not work.

Screenshots

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System (please complete the following information):

• Browser with version [e.g. chrome, safari]: Chrome
• App version [e.g. 0.1.0]: 2.4.0
• Nextcloud version [e.g. 18.0.1]: 25.0.3
• BigBlueButton version [e.g. 2.2.9]: 2.5.x
• Is your BigBlueButton instance working with Greenligh? no
• Did you enter your BBB API url and secret? yes
• Are you using a load balancer, like Scalelite? yes

Nextcloud log:

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Javascript log:

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Additional context

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[sualko]

Without log entries, this is hard to debug.