Editing from timeline does not work

[DeadlySquad13]

Hello, thanks for your hard work developing this instrument!
Unfortunately, editing timeline in a browser doesn't work while running from cli on a local file:

mw serve test.mw -o timeline

Is this feature supported in cli? Otherwise could you please show a direction in which editing can be achieved: maybe the whole app should be self-hosted? Maybe it is just some bug in current version? I'm developer willing to help solve this issue, but I'm new to this project: some pointers would be a huge help!

Originally posted by @DeadlySquad13 in mark-when/markwhen#113 (comment)