fontawesome

Hey Christian,
Where are you trying to upload fontawesome?
Typically you do not upload fontawesome, it is not compatible with the theme font manager and will not show in the ALB icons.
So you need to sign up here to get your “Kit”
Then you will get a code like this to put in your header: <script src="https://kit.fontawesome.com/244e4f20aaa.js" crossorigin="anonymous"></script>
add it to the end of your child theme functions.php file in Appearance ▸ Editor in this function:

function Font_Awesome_7(){
?>
<script src="https://kit.fontawesome.com/244e4f20aaa.js" crossorigin="anonymous"></script>
<?php
}
add_action('wp_head', 'Font_Awesome_7');

be sure to change the link to yours.
Then choose your icon and make sure that you add a size to the icon code, for example <i class="fas fa-mug-hot fa-10x"></i>
and add it to your page.

See this documentation:
https://docs.fontawesome.com/

Note they also have a plugin, I have not tried it, see: https://docs.fontawesome.com/web/use-with/wordpress

Best regards,
Mike