The filament Manager seems to only work, if Octoprint runs AT Port 80. Mine runs AT Port 5000. I'm Sure i have installed the filament Manager plugin

Response:
😖 Error changing spool
Error text:

<title>404 Not Found</title>

Not Found

The requested URL /plugin/filamentmanager/spools was not found on this server.

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Apache/2.4.38 (Raspbian) Server at localhost Port 80