I have custom icons that work fine on IOS and Android. When I deploy on the Web, a crossed out box appears in each place in the App where my icon should appear.
twitter4j
openmrs
http-auth
fancy-pointers
svgutils
obfuscation
biztalk-2016
smtp-oauth
tink
python-fu
cllocation
makefile
msal
fabricjs2
azure-mysql-database
host
datagridcell
nsbuttoncell
canactivate
dijit.dialog
fullcalendar-scheduler
gige-sdk
tumblr-themes
build-triggers
modem
csp-html-webpack-plugin
sublime-text-plugin
twilio-conference
ui5-webcomponents
notion-js
