Hi Barryn2000,
The workaround shouldn’t be necessary.
Are you using 2.38.5? A bug in 2.38.4 prevented the plugin from finding custom icons.
They must be uploaded to:
/wp-content/uploads/mappress/icons
The dropdown icon picker should show all the icons in that directory. If it’s not working, feel free to send me a login and I’ll take a look.