How to turn on Relative Mouse Offset mode when connected via web browser to Linux AppStream instance.

Hello!

My organization is looking to run an AppStream fleet to deploy our software to end users via a web browser. Our software requires that the mouse be set to Relative Mouse Offset mode (by hitting Ctrl-Shift-F8 while in the AppStream instance), as users are able to pan the camera around a 360 degree photo in our software. Without that mode being set, the cursor simply hits and exits the edge of the browser frame and stops panning the camera.

We've tried some test runs on Windows based fleets and they work perfectly once the user hits Ctrl-Shift-F8. Our tests on Linux based fleets, however, seem to ignore that button combination when connecting via web browser. Both Windows and Linux fleets work perfectly when connecting via the Windows AppStream client app, but only the Windows fleets work when connected via a web browser. For our use case, we need to allow users to connect via web browser and be able to turn on Relative Mouse Offset mode. Is this possible when running Linux based fleets? There doesn't seem to be an option in the AppStream options menu on the web browser like there is when connecting via the downloaded AppStream client app, and for Linux based instances, the Ctrl-Shift-F8 shortcut doesn't seem to work either.

To summarize, we're looking for a way for a user to enable Relative Mouse Offset mode when connecting to a Linux based AppStream instance via a web browser.

Thank you to anyone reading this and especially to anyone able to offer assistance or suggestions!