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.
apollo-upload-client
iis-handlers
apk-expansion-files
keystore
pl-i
default-method
realm-functions
jca
jsweet
azure-sdk
file-upload
akismet
smtpjs
webpack-4
visual-c++-2010
scim
crostini
maven-invoker-plugin
front-camera
odoo-enterprise
wordle-word-cloud
corewlan
extra
react-google-maps-api
parcelable
.loc
list-unsubscribe
go-cobra
xticks
angularjs-ng-options