If you want to set up your logo in Openmeetings header you can do the following:
/opt/om/webapps/openmeetings/css/images/logo.png
with your logo fileThis is available in OpenMeetings 6.2.0 and later
First: Create the mobile icons assets. This can be done via a script
See also: Github: pwa-asset-generator
npm install --global pwa-asset-generator
pwa-asset-generator logo.svg
Second: Copy icons to relevant dir
The command above will generate all assets, place (and replace all) those into $OM_HOME/webapps/openmeetings/images/icons
You may need to clear your mobile device browser cache to see icons refresh.